the human hypoxanthine phosphoribosyl-transferase ( imp : pyrophosphate phosphoribosyltransferase , ec 2.4.2.8 ) gene ( hprt ) has been serially transferred to mouse cells and then to chinese hamster fibroblasts by two cycles of metaphase chromosome isolation and incubation with recipient cells .
C0016030
fibroblasts
C0007634
cells