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In the present investigation we show for the first time that bioconversion of a primary mycosporine‐like amino acid (MAA) into a secondary MAA is regulated by sulfur deficiency in the cyanobacterium Anabaena variabilis PCC 7937. This cyanobacterium synthesizes the primary MAA shinorine (RT = 2.2 min, λmax = 334 nm) under normal conditions (PAR + UV‐A + UV‐B); however, under sulfur deficiency, a secondary...
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