Contents

13 November 1987
Vol 238, Issue 4829

About The Cover

Portion of an ear of corn showing the kernel phenotype obtained when the transposable element Spm excises from the opaque-2 locus during the course of endosperm development. Opaque-2 is a transacting regulator of seed storage protein expression. The opaque-mutable phenotype constitutes sectors of normal endosperm on an otherwise opaque (mutant) kernel. See page 960. [R. J. Schmidt, Brookhaven National Laboratory, Upton, NY 11973]