Contents

10 August 2001
Vol 293, Issue 5532

About The Cover

Cover image expansion

COVER False-color image of the head of a fruit fly, showing the stochastic epigenetic silencing of a transgene encoding green fluorescent protein in individual ommatidia of the eyes. The importance of epigenetics in regulating gene activity is discussed in a special section in this issue. 1063 [Photo by Kami Ahmad]