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Fig. 6. The BL-CFC defect in Arnt/ cells is cell
extrinsic. (A) Arnt+/+ neos
lacZ and Arnt/
neor lacZ+ ES cells co-cultured during EB
differentiation, dissociated and replated in methylcellulose with or without
G418. (B) Under G418 selection, all surviving BL-CFCs stained blue indicating
ß-galactosidase activity from Arnt/
neor lacZ+ cells. Wild-type clones only
survived in the absence of G418.