29 May 2015
Vol 348, Issue 6238

About The Cover

Cover image expansion

COVER Proteins inside the chloroplast of a plant cell, including the supercomplex of photosystem I and light-harvesting complex I, work together to turn light into chemical energy. A high-resolution crystal structure by Qin et al. reveals the positions of chlorophylls a and b (shown in the foreground as circular and hexagonal disks, respectively) and carotenoids (shown in orange). See pages 970 and 989.
Illustration: Valerie Altounian/Science; structure based on experimental atomic coordinates (PDB ID 4XK8)