(GenBank) In Mycobacterium tuberculosis strain H37Rv, PE_PGRS50 and PE_PGRS49 exists as a single gene. In Mycobacterium bovis, a single base deletion (g-*) splits PE_PGRS50 into 2 parts, PE_PGRS50a and PE_PGRS50b and a single base deletion (c-*) leads to PE_PGRS49 and PE_PGRS50b existing as a single product. In Mycobacterium bovis BCG Pasteur, the first deletion is absent leading to an uniq single gene comprising PE_PGRS50 and PE_PGRS49