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The specific accumulation of vanadium by certain ascidians, known as sea squirts or tunicates, has been of long-standing interest. Since vanadium is in the +5 oxidation state in sea water but in the +3 state in ascidian blood cells, some reducing agent must participate in the accumulation process. Tunichromes, a class of hydroxy-dopa containing tripeptides, have been significantly studied as a candidate...