Contents

19 July 2002
Vol 297, Issue 5580

About The Cover

Cover image expansion

COVER The head of an embryonic transgenic mouse expressing a stabilized b-catenin protein in neural precursor cells (coronal section, stained with cresyl violet). The cortical surface of the brain is enlarged, with increased surface area and folding of the cortex, indicating that b-catenin can regulate whether neural precursor cells proliferate or differentiate. [Image: A. Chenn]. See page 365 [Image: A. Chenn]