with the long-range goals of elucidating the biochemical genetics and the phenotypic expression , both in vitro and in vivo , of mutator strains of mammalian cells , we have isolated and partially characterized a series of drug-resistant mutants from a subline a feeder-dependent parental mouse teratocarcinoma line ( psa-1 ) known to be capable of chimerizing host blastocysts via the injection of inner cell mass .
C1281743
blastocysts
C1283994
inner cell mass