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Linear maps of vanA encoding regions of the prototype Tn1546 (GenBank M97297) from human E. faecium B4147 [35], and of vancomycin-resistant enterococci from healthy food-producing animals. Yellow stars indicate the G to T nucleotide point mutation at position 8234 in vanX; aadK, aminoglycoside 6-adenylyltransferase; merA, mercury resistance gene; *, putative open reading frames.
