isozyme profiles for 32 enzyme systems were studied in tumors induced by two strains of polyoma virus ( 2pta and lid1 ) , in two conventional mouse strains ( c3h/bida and nih ) , and in athymic ( nude ) mice of two genetic backgrounds ( c3h/hes nu/nu and nih nu/nu ) .
C0022173
isozyme
C0014442
enzyme