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Overview
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P21 is one of the inhibitors of the phosphorylation of the cyclin-cdk complex. p21, which is an inhibitorof G1 cdks, suppresses the cell cycle and inhibits DNA synthesis. Although p21 is induced by p53 andinhibits cdk (cyclin-dependent kinase) activity, there was virtually no correlation between theexpression of p21 and that of p53; this finding was consistent with two reports, though anotherreported an inverse correlation between the expression of p21 and that of p53. p53ìindependentexpression of p21 might account for the discrepancy between the expression of p53 and that of p21. Itis expressed in normal human tissue and a wide array of tumors.
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- Properties
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Overview