Contents

01 January 1999
Vol 283, Issue 5398

About The Cover

Cover image expansion

COVER Localization of CmPP16 messenger RNA (mRNA) in the vascular tissue of pumpkin plants (image width ~500 mm). In this cross section of a petiole showing a vascular bundle, the green fluorescence identifies CmPP16 mRNA within companion cells and sieve elements of the phloem. CmPP16 has properties similar to plant viral movement proteins and appears to mediate mRNA entry into the phloem transport system. See page 94. [Image: R. Ruiz-Medrano, B. Xoconostle-Cázares, W. J. Lucas]