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Electrospray ionization mass spectrometry (ESI-MS) profile of (A) synthetic DOPA-melanin and (B) melanin isolated from Aeromonas media strain WS. Note that the molecular ions at m/z 146, 274, and 318 were present in both; particularly, note m/z 146, which corresponds to indole-5, 6-quinone (marked with small red arrows).
