Increased thymidine uptake by methylcholanthrene-treated C3H/10T1/2 cells.

The uptake of 3H-thymidine in post-confluent cultures of methylcholanthrene-transformed C3H/10T1/I mouse embryo cells was markedly higher than in their non-transformed counterparts. In a reconstruction experiment as few as 2% transformed cells could be detected by increased thymidine uptake. Measurements made at various times up to 110 days in multi-chambered plates revealed that after 25 days methylcholanthrene-treated cultures incorporated significantly more thymidine than the acetone-treated controls. This increased uptake correlated with the appearance of Type III transformed foci.