- The bovine genes for phosphoglycerate kinase, glucose-6-phosphate dehydrogenase, alpha-galactosidase, and hypoxanthine phosphoribosyltransferase are linked to the X chromosome in cattle-mouse cell hybrids. Shimizu, N., Shimizu, Y., Kondo, I., Woods, C., Wegner, T. Cytogenet. Cell Genet. (1981)