Structure of a photosystem I-ferredoxin complex from a marine cyanobacterium provides insights into far-red light photoacclimation.

a) The study reveals the role of chlorophyll in photosystem I
b) The study explores the effect of far-red light on photosystem I
c) The study investigates the role of ferredoxin in photosynthesis
d) The study examines the structure of photosystem II in cyanobacteria