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(A) ESR spectroscopy of melanin particles collected from H. capsulatum strain CIB 1980 grown for 15 days in minimal medium with L-DOPA. (B) ESR spectroscopy of H. capsulatum strain G217B grown in BHI medium for 21 days. ESR spectroscopy of yeast cells grown in minimal medium without a phenolic substrate for 21 days does not produce a free radical signal.
