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- W2014044453 abstract "Phosphorylation of the retinoblastoma protein (Rb) during the G1-phase of the mammalian cell division cycle is currently believed to be a controlling element regulating the passage of cells into S-phase. We find, however, that the suspension-grown cell lines U937, L1210, and MOLT-4 contain exclusively hyperphosphorylated Rb. Furthermore, when adherent NIH3T3 cells are grown at very low densities to avoid overgrowth and contact inhibition, they also contain only hyperphosphorylated Rb. NIH3T3 cells exhibit hypophosphorylation when the cells are grown at moderate to high cell densities. We propose that cultures of adherent cells such as NIH3T3, when grown to moderate cell densities, are made up of two populations of cells: (a) cells that are relatively isolated and therefore growing exponentially without contact inhibition, and (b) cells that are growth-inhibited by local cell density or contact inhibition. The common observation in adherent cell lines, that Rb is both hyper- and hypophosphorylated in the G1-phase and only hyperphosphorylated in the S- and G2-phases, is explained by the effects of cell density and contact inhibition. Thus, phosphorylation-dephosphorylation of Rb protein during the G1 phase is not a necessary process during the NIH3T3, L1210, MOLT-4, and U937 division cycles. We propose that phosphorylation-dephosphorylation of Rb is independent of the division cycle and is primarily determined by growth conditions throughout the division cycle." @default.
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- W2014044453 title "Phosphorylation-Dephosphorylation of Retinoblastoma Protein Not Necessary for Passage through the Mammalian Cell Division Cycle" @default.
- W2014044453 doi "https://doi.org/10.1080/713803488" @default.
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