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In cell cycle, most of the regulatory actions occur at the so-called restriction point (R) in the late G1 phase. Tumor suppressor genes; Rb, p53 and p21 are among the most important of the agents suppressing transition through R point. Changes in the expression of Rb (retinoblastoma) gene correlate with the presence of Rb protein and they are believed to be an early event in carcinogenesis. This issue...
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