10 November 2006
Vol 314, Issue 5801

About The Cover

Cover image expansion

COVER The sea urchin, Strongylocentrotus purpuratus, has been a premier model for understanding the gene networks that underlie development. Shown are sea urchin pluteus larvae stained to reveal the ectoderm (green), mesoderm (blue), and endoderm (red). A special section beginning on page 938 describes the sequencing of the genome of the sea urchin and initial insights obtained from the sequence. Images: Esther Miranda and David R. McClay