a 30-mug dose of 3-methylcholanthrene ( mca ) was applied for 1 week to normal balb/c fibroblasts in cell-impermeable diffusion chambers ( dc ) in the peritoneal cavities of balb/c micemtwo groups of dc cultures , in which the carcinogen was given during weeks 1 and 5 of cultivation , respectively , were compared for the frequency of malignant transformation and for the immunogenicity of the resulting neoplasms .
C0007634
normal
C0016030
fibroblasts