Source:http://linkedlifedata.com/resource/umls/id/C0043381
MSH: The male sex chromosome, being the differential sex chromosome carried by half the male gametes and none of the female gametes in humans and in some other male-heterogametic species in which the homologue of the X chromosome has been retained.,GO: The sex chromosome present in males of species in which the male is the heterogametic sex; generally, the sex chromosome that pairs with the X chromosome in the heterogametic sex. The Y chromosome is absent from the cells of females and present in one copy in the somatic cells of males. [GOC:mah, ISBN:0582227089],NCI: The male sex chromosome, being the differential sex chromosome carried by half the male gametes and none of the female gametes in man and in some other male-heterogametic species in which the homologue of the X chromosome has been retained.