Contents

21 February 2003
Vol 299, Issue 5610

About The Cover

Cover image expansion

COVER Mice, like many territorial mammals, use pheromones to identify fellow animals and to determine their reproductive readiness. Recording from single nerve cells in the brain's pheromone-processing region during intimate social interactions, as described on page 1196, provides a picture of how these powerful yet mysterious signals are represented in the mammalian brain. [Illustration: Terry E. Smith]