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Medical Definition of Mycoplasma penetrans
1. A species of gram-negative, facultatively anaerobic bacteria. This organism shows remarkable pathobiologic properties: it adheres to cell surfaces, deeply penetrates into the cell, and strongly adsorbs human red blood cells and human CD4+ lymphocytes and monocytes. M. Penetrans was first isolated from the urogenital tract of patients with aids and high frequencies of antibodies to it are seen in HIV-infected patients. (12 Dec 1998)