The ferrichrome content of cells of the smut fungus Ustilago sphaerogena during growth in a medium deficient in zinc increases with increase in the cobalt of the medium from 0 to 3 X 10(-5)M. The addition of zinc to such cultures prevents the accumulation of ferrichrome. The results suggest that zinc is involved in the utilization of iron via a process which can be blocked by cobalt.
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Komai et al. (1966) studied this question.
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