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Effects of cell density and exogenous BMP-4 on BMP-4 mRNA expression by A33 cells. (A) Effect of initial plating density (20,000 or 40,000 cells per 6-cm dish) on BMP-4 mRNA expression. (B) Effect of exogenous BMP-4 (10 or 50 ng/ml) on BMP-4 mRNA expression by A33 cells.
