The antenna complex functions as a light receptor, it captures and delivers excitation energy to photosystems II and I. The pcb genes are not related to higher plant LHCs. Chlorophyll a. Chlorophyll b. The antenna complex consists of chlorophylls (a and b) and chlorophyll a/b binding proteins. By iron stress. Belongs to the PsbB/PsbC family. IsiA/Pcb subfamily.