diff --git a/README.md b/README.md
index 41bb4e7bc..b8d7cbb32 100644
--- a/README.md
+++ b/README.md
@@ -393,7 +393,7 @@ Daniel Cooke and Gerton Lunter
 
 ## Citing
 
-Please cite the preprint: [A unified haplotype-based method for accurate and comprehensive variant calling](https://www.biorxiv.org/content/early/2018/10/29/456103).
+Please cite the paper: [A unified haplotype-based method for accurate and comprehensive variant calling](https://www.nature.com/articles/s41587-021-00861-3).
 
 ## License
 
diff --git a/scripts/install.py b/scripts/install.py
index 4b1854ad1..9e78d3d4b 100755
--- a/scripts/install.py
+++ b/scripts/install.py
@@ -17,7 +17,7 @@
 forests = ['germline', 'somatic']
 
 latest_llvm = 'llvm'
-latest_gcc = 'gcc@10'
+latest_gcc = 'gcc'
 
 required_curl_version = 7, 41, 0
 required_git_version = 2, 7, 0
@@ -262,10 +262,8 @@ def get_brewed_compiler_binaries(homebrew_dir):
     else:
         gcc_dir = cellar_dir / latest_gcc
         gcc_version = os.listdir(str(gcc_dir))[0]
-        gcc_bin_dir = gcc_dir /gcc_version / 'bin'
-        gcc_bin_name = latest_gcc.replace('@', '-')
-        gxx_bin_name =  gcc_bin_name.replace('cc', '++')
-        return gcc_bin_dir / gcc_bin_name, gcc_bin_dir / gxx_bin_name
+        gcc_bin_dir = gcc_dir / gcc_version / 'bin'
+        return gcc_bin_dir / 'gcc', gcc_bin_dir / 'g++'
 
 def patch_homebrew_centos_gcc9(homebrew_dir):
     homebrew_bin_dir = homebrew_dir / 'bin'
diff --git a/src/config/option_parser.cpp b/src/config/option_parser.cpp
index b7eb59db0..d3734fab1 100644
--- a/src/config/option_parser.cpp
+++ b/src/config/option_parser.cpp
@@ -22,6 +22,8 @@
 #include "exceptions/user_error.hpp"
 #include "config.hpp"
 
+#include "core/csr/measures/measure_factory.hpp"
+
 namespace po = boost::program_options;
 namespace fs = boost::filesystem;
 
@@ -776,8 +778,10 @@ OptionMap parse_options(const int argc, const char** argv)
     .add(variant_discovery).add(haplotype_generation).add(general_variant_calling)
     .add(cancer).add(trio).add(polyclone).add(cell).add(call_filtering);
     
+    po::options_description conditional_help_options("Octopus help command line options");
+    conditional_help_options.add(general).add(call_filtering);
     OptionMap vm_init;
-    po::store(run(po::command_line_parser(argc, argv).options(general).allow_unregistered()), vm_init);
+    po::store(run(po::command_line_parser(argc, argv).options(conditional_help_options).allow_unregistered()), vm_init);
     
     if (vm_init.count("help") == 1) {
         po::store(run(po::command_line_parser(argc, argv).options(general_variant_calling).allow_unregistered()), vm_init);
@@ -821,6 +825,10 @@ OptionMap parse_options(const int argc, const char** argv)
         } else {
             std::cout << all << std::endl;
         }
+        if (vm_init.count("annotations") == 1) {
+            std::cout << "Available annotations:\n" << std::endl;
+            csr::print_all_measures_help(std::cout);
+        }
         return vm_init;
     }
     
diff --git a/src/core/callers/cancer_caller.cpp b/src/core/callers/cancer_caller.cpp
index cff824ced..5a337eaa1 100644
--- a/src/core/callers/cancer_caller.cpp
+++ b/src/core/callers/cancer_caller.cpp
@@ -1492,9 +1492,9 @@ void CancerCaller::log(const ModelPosteriors& model_posteriors) const
 
 namespace debug {
 
-template <typename S>
+template <typename S, typename GenotypeReference>
 void print_genotype_posteriors(S&& stream,
-                               const std::unordered_map<Genotype<IndexedHaplotype<>>, double>& genotype_posteriors,
+                               std::vector<std::pair<GenotypeReference, double>> genotype_posteriors,
                                const std::size_t n = std::numeric_limits<std::size_t>::max())
 {
     const auto m = std::min(n, genotype_posteriors.size());
@@ -1503,14 +1503,10 @@ void print_genotype_posteriors(S&& stream,
     } else {
         stream << "Printing top " << m << " genotype posteriors " << '\n';
     }
-    using GenotypeReference = std::reference_wrapper<const Genotype<IndexedHaplotype<>>>;
-    std::vector<std::pair<GenotypeReference, double>> v {};
-    v.reserve(genotype_posteriors.size());
-    std::copy(std::cbegin(genotype_posteriors), std::cend(genotype_posteriors), std::back_inserter(v));
-    const auto mth = std::next(std::begin(v), m);
-    std::partial_sort(std::begin(v), mth, std::end(v),
+    const auto mth = std::next(std::begin(genotype_posteriors), m);
+    std::partial_sort(std::begin(genotype_posteriors), mth, std::end(genotype_posteriors),
                       [] (const auto& lhs, const auto& rhs) { return lhs.second > rhs.second; });
-    std::for_each(std::begin(v), mth,
+    std::for_each(std::begin(genotype_posteriors), mth,
                   [&] (const auto& p) {
                       print_variant_alleles(stream, p.first.get());
                       stream << " " << p.second << '\n';
@@ -1544,6 +1540,10 @@ void CancerCaller::log(const GenotypeVector& germline_genotypes,
         auto map_somatic = find_map_genotype(cancer_posteriors);
         auto map_cancer_genotype = map_somatic->first.get();
         somatic_log << "MAP cancer genotype: ";
+        auto weighted_cancer_posteriors = zip_cref(cancer_genotypes, somatic_inferences.weighted_genotype_posteriors);
+        auto weighted_somatic_log = stream(*debug_log_);
+        weighted_somatic_log << "Weighted cancer genotypes... ";
+        debug::print_genotype_posteriors(weighted_somatic_log, weighted_cancer_posteriors, 10);
         debug::print_variant_alleles(somatic_log, map_cancer_genotype);
         somatic_log << ' ' << map_somatic->second;
         auto map_marginal_germline = find_map_genotype(germline_genotype_posteriors);
@@ -1553,7 +1553,10 @@ void CancerCaller::log(const GenotypeVector& germline_genotypes,
         marginal_germline_log << ' ' << map_marginal_germline->second;
     }
     if (trace_log_) {
-        debug::print_genotype_posteriors(stream(*trace_log_), germline_genotype_posteriors);
+        auto weighted_cancer_posteriors = zip_cref(cancer_genotypes, somatic_inferences.weighted_genotype_posteriors);
+        auto weighted_somatic_log = stream(*trace_log_);
+        weighted_somatic_log << "Weighted cancer genotypes... ";
+        debug::print_genotype_posteriors(weighted_somatic_log, weighted_cancer_posteriors);
     }
 }
 
diff --git a/src/core/csr/measures/measure_factory.cpp b/src/core/csr/measures/measure_factory.cpp
index f1e449b89..e16871ec7 100644
--- a/src/core/csr/measures/measure_factory.cpp
+++ b/src/core/csr/measures/measure_factory.cpp
@@ -11,6 +11,8 @@
 #include "exceptions/user_error.hpp"
 #include "utils/map_utils.hpp"
 #include "utils/string_utils.hpp"
+#include "io/variant/vcf_header.hpp"
+#include "io/variant/vcf_spec.hpp"
 
 namespace octopus { namespace csr {
 
@@ -163,5 +165,36 @@ std::vector<std::string> get_all_measure_names()
     return extract_sorted_keys(measure_makers);
 }
 
+VcfHeader make_header(const std::vector<MeasureWrapper>& measures)
+{
+    VcfHeader::Builder builder {};
+    for (const auto& measure : measures) {
+        measure.annotate(builder);
+    }
+    return builder.build_once();
+}
+
+void print_help(const std::vector<MeasureWrapper>& measures, std::ostream& os)
+{
+    const auto header = make_header(measures); 
+    os << "Name\tKind\tNumber\tType\tDescription" << std::endl;
+    for (const auto& measure : measures) {
+        os << measure.name() << '\t';
+        using namespace vcfspec::header;
+        const auto kind = header.has(format, measure.name()) ? format : info;
+        os << kind << '\t';
+        os << get_id_field_value(header, kind, measure.name(), meta::struc::number) << '\t';
+        os << get_id_field_value(header, kind, measure.name(), meta::struc::type) << '\t';
+        os << get_id_field_value(header, kind, measure.name(), meta::struc::description) << '\t';
+        os << std::endl;
+    }
+}
+
+void print_all_measures_help(std::ostream& os)
+{
+    const auto measures = make_measures(get_all_measure_names());
+    print_help(measures, os);
+}
+
 } // namespace csr
 } // namespace octopus
diff --git a/src/core/csr/measures/measure_factory.hpp b/src/core/csr/measures/measure_factory.hpp
index 41ecc3542..e367c4180 100644
--- a/src/core/csr/measures/measure_factory.hpp
+++ b/src/core/csr/measures/measure_factory.hpp
@@ -6,6 +6,7 @@
 
 #include <string>
 #include <vector>
+#include <ostream>
 
 #include "utils/string_utils.hpp"
 #include "measure.hpp"
@@ -18,6 +19,9 @@ std::vector<MeasureWrapper> make_measures(std::vector<std::string> names);
 
 std::vector<std::string> get_all_measure_names();
 
+void print_help(const std::vector<MeasureWrapper>& measures, std::ostream& os);
+void print_all_measures_help(std::ostream& os);
+
 } // namespace csr
 } // namespace octopus
 
diff --git a/src/core/models/genotype/subclone_model.cpp b/src/core/models/genotype/subclone_model.cpp
index 597699b87..ed73fc15c 100644
--- a/src/core/models/genotype/subclone_model.cpp
+++ b/src/core/models/genotype/subclone_model.cpp
@@ -133,6 +133,10 @@ compute_genotype_likelihoods_with_fixed_mixture_model(const std::vector<SampleNa
     return result;
 }
 
+auto evaluate(const Genotype<IndexedHaplotype<>>& genotype, const ConstantMixtureGenotypeLikelihoodModel& model)
+{
+    return model.evaluate(genotype);
+}
 auto evaluate(const CancerGenotype<IndexedHaplotype<>>& genotype, const ConstantMixtureGenotypeLikelihoodModel& model)
 {
     return model.evaluate(demote(genotype));
@@ -243,14 +247,41 @@ generate_seeds(const std::vector<SampleName>& samples,
     if (result.size() > max_seeds) return result;
     max_seeds -= result.size();
     result.reserve(max_seeds);
-    result.push_back(genotype_log_priors);
-    IndividualModel germline_model {priors.genotype_prior_model};
-    if (haplotypes) germline_model.prime(*haplotypes);
+    ConstantMixtureGenotypeLikelihoodModel basic_likelihood_model {haplotype_log_likelihoods};
+    std::vector<LogProbabilityVector> basic_sample_likelihoods {};
+    basic_sample_likelihoods.reserve(samples.size());
     for (const auto& sample : samples) {
-        haplotype_log_likelihoods.prime(sample);
-        auto latents = germline_model.evaluate(genotypes, haplotype_log_likelihoods);
-        result.push_back(std::move(latents.posteriors.genotype_log_probabilities));
+        basic_likelihood_model.cache().prime(sample);
+        basic_sample_likelihoods.push_back(evaluate(genotypes, basic_likelihood_model));
     }
+    auto basic_likelihoods = add_all_and_normalise(basic_sample_likelihoods);
+    auto basic_posteriors = add_and_normalise(genotype_log_priors, basic_likelihoods);
+    result.push_back(basic_posteriors);
+    --max_seeds;
+    if (max_seeds == 0) return result;
+    result.push_back(basic_likelihoods);
+    --max_seeds;
+    if (max_seeds == 0) return result;
+    result.push_back(genotype_log_priors);
+    maths::normalise_logs(result.back());
+    --max_seeds;
+    if (max_seeds == 0) return result;
+    for (auto& likelihoods : basic_sample_likelihoods) {
+        result.push_back(std::move(likelihoods));
+        --max_seeds;
+        if (max_seeds == 0) return result;
+    }
+    std::vector<std::pair<double, std::size_t>> ranked_basic_posteriors {};
+    ranked_basic_posteriors.reserve(genotypes.size());
+    for (std::size_t i {0}; i < genotypes.size(); ++i) {
+        ranked_basic_posteriors.push_back({basic_posteriors[i], i});
+    }
+    const auto nth_ranked_basic_posteriors_itr = std::next(std::begin(ranked_basic_posteriors), max_seeds);
+    std::partial_sort(std::begin(ranked_basic_posteriors),
+                      nth_ranked_basic_posteriors_itr,
+                      std::end(ranked_basic_posteriors), std::greater<> {});
+    std::transform(std::begin(ranked_basic_posteriors), nth_ranked_basic_posteriors_itr,
+                   std::back_inserter(result), [&] (const auto& p) { return make_point_seed(genotypes.size(), p.second); });
     return result;
 }
 
diff --git a/src/io/variant/vcf_header.cpp b/src/io/variant/vcf_header.cpp
index 753d7cc64..b41112665 100644
--- a/src/io/variant/vcf_header.cpp
+++ b/src/io/variant/vcf_header.cpp
@@ -51,7 +51,11 @@ bool VcfHeader::has(const Tag& t) const noexcept
 
 bool VcfHeader::has(const Tag& t, const StructuredKey& k) const noexcept
 {
-    return structured_fields_.count(t) > 0; // TODO: complete this
+    const auto er = structured_fields_.equal_range(t);
+    return std::find_if(er.first, er.second,
+                        [&] (const auto& p) {
+                            return p.second.at(vcfspec::header::meta::struc::id) == k;
+                        }) != er.second;
 }
 
 const VcfHeader::Value& VcfHeader::at(const BasicKey& k) const
@@ -59,8 +63,8 @@ const VcfHeader::Value& VcfHeader::at(const BasicKey& k) const
     return basic_fields_.at(k);
 }
 
-const VcfHeader::Value& VcfHeader::find(const Tag& search_tag, const StructuredKey& search_key,
-                                        const StructuredKey& id_key, const Value& id_value) const
+const VcfHeader::Value& VcfHeader::find(const Tag& search_tag, const StructuredKey& id_key,
+                                        const Value& id_value, const StructuredKey& search_key) const
 {
     const auto er = structured_fields_.equal_range(search_tag);
     return std::find_if(er.first, er.second,
@@ -118,15 +122,19 @@ const VcfHeader::StructuredFieldMap& VcfHeader::structured_fields() const noexce
 
 // non-member methods
 
-const VcfHeader::Value& get_id_field_value(const VcfHeader& header, const VcfHeader::Tag& tag,
-                                           const VcfHeader::Value& id_value,
-                                           const VcfHeader::StructuredKey& lookup_key)
+const VcfHeader::Value&
+get_id_field_value(const VcfHeader& header, 
+                   const VcfHeader::Tag& tag,
+                   const VcfHeader::StructuredKey& id_value,
+                   const VcfHeader::StructuredKey& lookup_key)
 {
     return header.find(tag, vcfspec::header::meta::struc::id, id_value, lookup_key);
 }
 
-const VcfHeader::Value& get_id_field_type(const VcfHeader& header, const VcfHeader::Tag& tag,
-                                              const VcfHeader::Value& id_value)
+const VcfHeader::Value& 
+get_id_field_type(const VcfHeader& header, 
+                  const VcfHeader::Tag& tag,
+                  const VcfHeader::Value& id_value)
 {
     using namespace vcfspec::header::meta;
     return header.find(tag, struc::id, id_value, struc::type);
diff --git a/src/io/variant/vcf_header.hpp b/src/io/variant/vcf_header.hpp
index 081806c0e..bc9f84ae7 100644
--- a/src/io/variant/vcf_header.hpp
+++ b/src/io/variant/vcf_header.hpp
@@ -102,8 +102,8 @@ class VcfHeader : public Equitable<VcfHeader>
     bool has(const Tag& tag, const StructuredKey& k) const noexcept;
     
     const Value& at(const BasicKey& k) const;
-    const Value& find(const Tag& search_tag, const StructuredKey& search_key,
-                      const StructuredKey& id_key, const Value& id_value) const;
+    const Value& find(const Tag& search_tag, const StructuredKey& id_key,
+                      const Value& id_value, const StructuredKey& search_key) const;
     
     std::vector<BasicKey> basic_keys() const;
     std::vector<Tag> tags() const;
@@ -162,12 +162,16 @@ VcfHeader::VcfHeader(T&& file_format, U&& samples, B&& basic_fields, S&& structu
 , structured_fields_ {std::forward<S>(structured_fields)}
 {}
 
-const std::string& get_id_field_value(const VcfHeader& header, const VcfHeader::Tag& t,
-                                      const VcfHeader::StructuredKey& id_value,
-                                      const VcfHeader::StructuredKey& lookup_key);
+const VcfHeader::Value&
+get_id_field_value(const VcfHeader& header, 
+                   const VcfHeader::Tag& t,
+                   const VcfHeader::StructuredKey& id_value,
+                   const VcfHeader::StructuredKey& lookup_key);
 
-const std::string& get_id_field_type(const VcfHeader& header, const VcfHeader::Tag& t,
-                                     const VcfHeader::Value& id_value);
+const VcfHeader::Value& 
+get_id_field_type(const VcfHeader& header, 
+                  const VcfHeader::Tag& t,
+                  const VcfHeader::Value& id_value);
 
 VcfType get_typed_value(const VcfHeader& header, const VcfHeader::Tag& t,
                         const VcfHeader::StructuredKey& key, const VcfHeader::Value& value);