Abstract
Western blot analysis showed that the 46-kilodalton (kDa) dimeric protein antigen secreted in large amounts by some daughter strains of Mycobacterium bovis BCG corresponded to protein MPB70 present in long-term culture filtrates of the Japanese substrain. The 46/23-kDa antigen is the most abundant protein in supernatant from a 5-day culture but is masked by leaked products in old culture supernatants. No similarities were found between the 46-kDa protein and MPB64, a protein with the same strain distribution, or with the antigen of similar molecular mass recognized by monoclonal antibody SA1.D2D.
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