18 July 2003
Vol 301, Issue 5631

About The Cover

Cover image expansion

COVER Normal and developmentally defective inflorescences of Arabidopsis thaliana. The defective flower buds have a disorganized appearance because they express a transgene encoding a viral suppressor of RNA silencing, which interferes with microRNA function. MicroRNAs are required for proper developmental timing in plants and animals. 325 [Images: Zhixin Xie and Kristin Kasschau]