Contents

05 April 2019
Vol 364, Issue 6435

About The Cover

Cover image expansion

COVER Male flowers of the maize plant (Zea mays L. ssp. mays). Maize cells undergo a complex series of steps during the introductory stages of meiosis. Single-cell RNA sequencing analysis of developing male germinal cells reveals distinctive patterns of gene expression and sheds light on meiotic progress. See page 52. Photo: Brad Nelms