has_defining_feature Copy number complements represent sets of all copies of a particular biological sequence present in a particular genome. Their "identity" is based on their defining sequence, and the count of this sequence in the genome.The has_defining_feature property is used to specify the sequence defining a copy number complement - by using a 'sequence feature' as a proxy for the specific sequence of this feature on some reference. For copy number complements, it is the sequence of this proxy feature on some reference that defines sequences in a genome of interest that qualify for membership in the complement. For functional copy number complements (aka genetic dosage), it is the canonical function(s) performed by the sequence of this proxy feature (typically a gene) that helps to define sequences in a genome of interest that qualify for membership in the complement. Holds between a copy number complement or functional copy number complement and a genomic feature that serves as a proxy for the sequence that defines the complement. copy number complement functional copy complement sequence_feature