m11-x cells were obtained by fusing the human fibroblast cell line gm3552 ( which contains the translocation chromosome t ( 11 ; x ) that carries the human beta-like globin genes ) with hypoxanthine phosphoribosyltransferase ( hprt ) -negative tetraploid ( 2s ) mouse erythroleukemia ( mel ) cells .
C0016030
fibroblast
C0007634
cells