Absorption spectra of the chromophore of C‐phycocyanin, in its free base form and as its zinc complex, were measured after denaturation with 8 M urea and with a cationic detergent. An acidic and an alkaline form of the zinc complex are distinguished. The acidic form shows photoreversible photochrom‐ism, but only when it is embedded in detergent micelles. The photochromism is tentatively ascribed to a direct photoisomerization of the chromophore.
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J. De Kok (1985) studied this question.
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