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Predicted topology of the spinach D1 protein in 1980s. This topology model is basically rational, even now that the molecular structure has been revealed [6]. The figure is drawn based on the model reported by Trebst [64] with minor modifications. The sequence of D1 protein is indicated by one letter abbreviation of amino acids. White boxes represent predicted alpha-helices for transmembrane. An arrow indicates the cleavage site by the CtpA.
