23 July 1999
Vol 285, Issue 5427

About The Cover

Cover image expansion

COVER Cross section of Arabidopsis flowers (image width, 0.56 mm). Regulatory elements of the homeotic gene AGAMOUS can direct expression of a reporter gene (staining intensity increases from pink to purple) in the center of flowers, where AGAMOUS specifies stamen and carpel development. Activation of these elements requires that they are bound by LEAFY, a transcription factor that determines whether flowers will be generated instead of shoots or leaves. See page 585 [Image: K. Bomblies/D. Weigel]