SUMMARY: Fifty-three strains from six species of the genus were tested for their ability to produce gelatinase and to disintegrate the collagen matrix of bone. Some strains of and produced a true collagenase which brought about complete disintegration of the collagen substrate, while strains of and were either completely inactive or produced only partial disintegration. Collagenase production was always accompanied by gelatinase production but the reverse was not the case. Concentrated culture filtrates of were shown to contain collagenase and gelatinase whereas those of contained contained gelatinase only.


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