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Proteolytic digestion of phycobilisomes. (A) Digestion of phycobilisomes with formic acid. The arrow indicates the resulting fragment after Zn2+ stain at 2.78 kDa. There are also several signals at 17–20 kDa which refer to the unaffected α-subunit of phycocyanin and the α- and β-subunit of allophycocyanin.
