Abstract
The retinoblastoma gene product (RB) contributes to normal cell growth control. One of its functions is manifest as a block to exit from G1, which is carried out by an RB subspecies which is un- or underphosphorylated. After RB phosphorylation, a process which occurs towards the end of G1 in cycling cells, the block is lifted allowing a cell to enter S. Here, we review a series of results which speak to the elements of RB structure which contribute to this activity. Included is its internal colinear protein receptor domain (i.e. the 'pocket').
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