The antenna complex functions as a light receptor, it captures and delivers excitation energy to photosystem II (PSII). The Prochlorales 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. Also forms complexes with photosystem II (PSII), consisting of a PSII dimer with 5 or 10 associated Pcb subunits. PubMed:8986795 speculates that the protein is probably 2 residues longer than sequenced. Belongs to the PsbB/PsbC family. IsiA/Pcb subfamily.