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We assessed the expression and distribution of p21/Waf-1 in TLM1 melanoma cells that exhibit contact inhibition and require serum for growth. The growth stage of cells stimulated to enter the mitotic cell cycle synchronously and grow to confluence was characterized by distinct, yet consistent levels and patterns of distribution of p21/Waf-1. Significantly, sustained accumulation of p21/Waf-1 in the...