Pigment stoichiometries in the D1/D2/cytochrome b‐559 reaction center complex from spinach have been studied by spectrophotometry and normalphase silica HPLC of the solvent extracts. Based on the well‐accepted molar ratio Pheo a/P680 = 2, the results are summarized by Chl a/P680 = 6.01 ± 0.37 (n = 24) and β‐carotene/P680= 1.84 ± 0.11 (n = 4). These stoichiometries are significantly different from those of bacterial reaction center complexes.
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Kobayashi et al. (1990) studied this question.