... ain the thylakoid membrane [5]. Phycocyanin is the majorconstituent of the phycobilisomes, while allophycoc yaninholds the bridging pigments between phycobilisomes and the photosynthetic lamellae ... to the PCa,PCb,APCa and APCb, respectively. PC,phycocyanin; APC, allophycocyanin.Ó FEBS 2002 Study of phycobilisomes organization by HPLC-ESI-MS (Eur. J. Biochem. 269) 1539Synechocystis phycobilisomes, ... isobserved for the subcomplex contained i n the su crose band2 where the amount of the b-phycocyanin component issignificantly reduced. The allophycocyanins are mainlyfound in the second band,...