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CDK4 leads to the phosphorylation of RB1 on T821. 1 / 1
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"We found that Costello syndrome fibroblasts display elevated level of Rb phosphorylation on serine 780 (Ser (P)-780-Rb) and that pharmacological inhibition of Ras with radicicol, Mek and Erk with PD98059, or cyclin dependent kinase 4 with PD0332991 not only leads to down-regulation of Ser (P)-780-Rb levels but also enhances Rb phosphorylation on threonine 821 (Thr (P)-821-Rb), which coincides with the recovery of elastin production."