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OGF's inhibitory effects on DNA synthesis. RTCFs were seeded on 22-mm coverslips and treated for 72 hours with 10−6 M concentrations of OGF, NTX, or an equivalent volume of sterile water. BrdU (30 μM) was incorporated into RTCFs for 3 hours before staining. Data represent the percent BrdU-positive cells (mean ± SE). **Significantly different from control cells at P < 0.01.
