Rod linker protein, associated with phycoerythrin. Linker polypeptides determine the state of aggregation and the location of the disk-shaped phycobiliprotein units within the phycobilisome and modulate their spectroscopic properties in order to mediate a directed and optimal energy transfer. The phycobilisome is a hemidiscoidal structure that is composed of two distinct substructures: a core complex and six rods radiating from the core. Associated with phycoerythrin. By green light. Belongs to the phycobilisome linker protein family.