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Since melanin is considered a virulence factor in Cryptococcus neoformans, its suppression at 37 degrees C has been perplexing. We now show an opposite thermal regulation of superoxide dismutase (SOD), consistent with a compensatory mechanism. Moreover, we demonstrate normal SOD and catalase levels in albino, oxygen-sensitive mutants. These results suggest that melanin is an antioxidant factor comparable in importance to SOD.
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Jacobson et al. (1994) studied this question.
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