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BY WILLIAM F. LOOMIS
Department of Biology
University of California, San Diego
LaJolla, Calif.

" A human gene, CDC2Hs, is able to function in yeast that have lost their own CDC2 gene and are blocked in the cell cycle unless given the human gene. When phosphorylated,, the products of both the yeast and human genes signal their respective cells to leave the G1 phase of the cell cycle and enter the S phase. Regulation of transcription of the CDC2Hs gene may be involved in quiescence and senescence of human cells.

M.G. Lee, C.J. Norbury, N.K Spurr, P. Nurse, “Regulated expression and phosphorylation of a possible mammalian cell-cycle control protein,” Nature, 333 (6174), 676-9, 16 June 1988.

" The 3’ ends of most eukaryotic mRNAs are cleaved just past the hexanucleotide signal AAUAAA and several hundred adenosines moieties (polyA) are added. The 1gm transcript has two such sites, which have ...

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