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Some strains of Penicillium chrysogenum produce a proteinaceous hemolysin, chrysolysin™, when incubated on sheep's blood agar at 37°C but not at 23°C. However, 92% (11/12) of the indoor air isolates produced hemolysis but only 43% (3/7) of the non-indoor air isolates did so. Chrysolysin is an aggregating protein composed of approximately 2kDa monomers, contains one cysteine amino acid, and has an...