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The Scientist has asked a group of experts to periodically comment upon recent articles that they have found noteworthy. Their selections, presented here in every issue, are neither endorsements of content nor the result of systematic searching. Rather, they are personal choices of articles they believe the scientific community as a whole may also find interesting. Reprint. of any artieles cited here may be ordered through The Genuine Article, 5501 Market St., Philadelphia, Pa. 19104, or by tel

The Scientist Staff
The Scientist has asked a group of experts to periodically comment upon recent articles that they have found noteworthy. Their selections, presented here in every issue, are neither endorsements of content nor the result of systematic searching. Rather, they are personal choices of articles they believe the scientific community as a whole may also find interesting. Reprint. of any artieles cited here may be ordered through The Genuine Article, 5501 Market St., Philadelphia, Pa. 19104, or by telephoning (215)886-4899.

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...

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