The sex chromosome present in both sexes of species in which the male is the heterogametic sex. Two copies of the X chromosome are present in each somatic cell of females and one copy is present in males. [GOC:mah, GOC:mr, ISBN:0582227089, PMID:20622855, Wikipedia:XY_sex-determination_system]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component