PSII ≈40 Chla per PS: PSI ≈100 Chla per PS chlorophyll molecules/photosystem
||Vermaas WF et al., In vivo hyperspectral confocal fluorescence imaging to determine pigment localization and distribution in cyanobacterial cells. Proc Natl Acad Sci U S A. 2008 Mar 11 105(10):4050-5. doi: 10.1073/pnas.0708090105. p.4050 left column bottom paragraphPubMed ID18316743
|| Tang X-S, Diner BA (1994) Biochemical and spectroscopic characterization of a new oxygen-evolving photosystem II core complex from the cyanobacterium Synechocystis PCC 6803. Biochemistry 33: 4594–4603.  Byrdin M, et al. (2002) Light harvesting in photosystem I: Modeling based on the 2.5-angstrom structure of photosystem I from Synechococcus elongatus. Biophys J 83: 433–457.PubMed ID8161515, 12080132
||p.4050 left column bottom paragraph:"The pigments associated with the photosynthetic apparatus are bound to thylakoid proteins, modifying their spectral properties and providing a spatial distribution that aids in the efficiency of light harvesting and energy transfer to reaction center Chls. Pigments bound to integral membrane proteins in reaction center complexes in thylakoids of cyanobacteria include Chl a [˜40 per PS II (primary source 3) and ˜100 per PS I (primary source 4)] and carotenoids the latter act in photoprotection and 3Chl quenching but do not effectively transfer energy to Chl in cyanobacterial PS II (ref 5)." 3rd primary source studied cyanobacterium Synechocystis PCC 6803. 4th primary source studied cyanobacterium Synechococcus elongatus.