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Photosystem II calcium-binding polypeptides have been detected by their ability to selectively bind 45 Ca when immobilised onto nitrocellulose membrane following SDS-polyacrylamide gel electrophoresis. Two calcium-binding polypeptides of 26 kDa and 24 kDa are shown to be components of LHCII. The 24 kDa polypeptide was further characterised by N-terminal amino acid sequence analysis and shown to be the product of a type II cab gene. A third polypeptide of 33 kDa bound calcium more weakly and was not positively identified.