Rod linker protein, associated with phycocyanin. 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. This protein occurs in the rod, it is associated with phycocyanin. Belongs to the phycobilisome linker protein family.