This gene belongs to the VCX/Y gene family, which has multiple members on both X and Y chromosomes, and all are expressed exclusively in male germ cells. The X-linked members are clustered on chromosome Xp22 and Y-linked members are two identical copies of the gene within a palindromic region on Yq11. The family members share a high degree of sequence identity, with the exception that a 30-bp unit is tandemly repeated in X-linked members but occurs only once in Y-linked members. The VCX gene cluster is polymorphic in terms of copy number; different individuals may have a different number of VCX genes. VCX/Y genes encode small and highly charged proteins of unknown function. The presence of a putative bipartite nuclear localization signal suggests that VCX/Y members are nuclear proteins. This gene contains 10 repeats of the 30-bp unit.[5]
^Fukami M, Kirsch S, Schiller S, Richter A, Benes V, Franco B, Muroya K, Rao E, Merker S, Niesler B, Ballabio A, Ansorge W, Ogata T, Rappold GA (Sep 2000). "A Member of a Gene Family on Xp22.3, VCX-A, Is Deleted in Patients with X-Linked Nonspecific Mental Retardation". Am J Hum Genet. 67 (3): 563–73. doi:10.1086/303047. PMC1287516. PMID10903929.563-73&rft.date=2000-09&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1287516#id-name=PMC&rft_id=info:pmid/10903929&rft_id=info:doi/10.1086/303047&rft.aulast=Fukami&rft.aufirst=M&rft.au=Kirsch, S&rft.au=Schiller, S&rft.au=Richter, A&rft.au=Benes, V&rft.au=Franco, B&rft.au=Muroya, K&rft.au=Rao, E&rft.au=Merker, S&rft.au=Niesler, B&rft.au=Ballabio, A&rft.au=Ansorge, W&rft.au=Ogata, T&rft.au=Rappold, GA&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1287516&rfr_id=info:sid/en.wikipedia.org:VCX" class="Z3988">
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Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC139241. PMID12477932.16899-903&rft.date=2003&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC139241#id-name=PMC&rft_id=info:pmid/12477932&rft_id=info:doi/10.1073/pnas.242603899&rft_id=info:bibcode/2002PNAS...9916899M&rft.au=Strausberg RL&rft.au=Feingold EA&rft.au=Grouse LH&rft.au=Derge, JG&rft.au=Klausner, RD&rft.au=Collins, FS&rft.au=Wagner, L&rft.au=Shenmen, CM&rft.au=Schuler, GD&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC139241&rfr_id=info:sid/en.wikipedia.org:VCX" class="Z3988">