obsolete reference junction true hemizygous reference junction In the case of a transgenic insertion that creates a hemizygous locus, the refernce locus that this insertion is variant_with is the junction on the homologous chromosome at the same position where the insertion occurred. This is the 'hemizygous reference' junction. The junction-insertion pair represents the allelic complement at that locus, which is considered to be hemizygous. Most genotype syntaxes represent this hemizygous state with a ' /0' notation. A junction found at a chromosomal position where an insertion has occurred on the homologous chromosome, such that the junction represents the reference feature paired with the hemizygously inserted feature. Eliminating unecessary defined/organizational classes. Former logical def: junction and (has_sequence_attribute some reference) Subclass axiom: is_variant_with some insertion