following the discovery in feral mice of an electrophoretic variant ( a ) of the x-coded enzyme phosphoglycerate kinase ( pgk-1 ) which differs from the form ( b ) found in common laboratory mouse strains it was reported that fibrosarcomas induced chemically in hybrids of feral and laboratory-bred mice expressed both enzyme phenotypes , but the conclusion that both were expressed by neoplastic cells was based solely on morphological evidence .
C0016057
fibrosarcomas
C0597032
neoplastic cells