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rrb1 and rrb2 encode maize retinoblastoma-related proteins that interact with a plant d-type cyclin and geminivirus replication protein.unlike mammalian and yeast cells, little is known about how plants regulate g1 progression and entry into the s phase of the cell cycle. in mammalian cells, a key regulator of this process is the retinoblastoma tumor suppressor protein (rb). in contrast, g1 control in saccharomyces cerevisiae does not utilize an rb-like protein. we report here the cloning of cdnas from two zea mays genes, rrb1 and rrb2, that encode rb-related proteins. further, rrb2 transcripts are alternatively spliced to yield ...19979271385
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