Streptomyces Strains (IMAGE) American Phytopathological Society Caption Streptomyces strains 303 and 299 produce a pigment consistent with synthetic melanin. Credit Phytobiomes Journal Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.