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Low-iron minimal medium supported growth of Cryptococcus neoformans but spent medium contained no hydroxamates, organic acids or other iron chelators. Exogenous deferoxamine stimulated growth in extreme iron-limitation, while neither organic acids nor quartersaturated transferrins were stimulatory. These results suggest two iron uptake mechanisms, one dependent upon exogenous hydroxamate, the other hydroxamate-independent.
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Jacobson et al. (1987) studied this question.
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