05 January 1990
Vol 247, Issue 4938

About The Cover

Mapping the muscle glycogen phosphorylase gene on human chromosome 11 by chromosomal in situ suppression (CISS) hybridization. Fluorescent signals from the dinitrophenol-labeled cosmid probe are visualized as yellow dots on the propidium iodide (red) counterstained chromosome spread. See p. 64. [Photograph by Peter Lichter and David C. Ward]