FIG. 3.
Schematic diagram showing different blaCMY-2 regions. The primary element consists of eight genes downstream of traA, as shown for pAR060302. A second copy of this segment (inverted) is inserted immediately upstream of the original segment in pSN254 and pAM04528. Note that the proposed reversal in directionality of tnpA is suspect due to the sequence symmetry in this region (see Discussion). A duplicated blaCMY-2 region is also present in peH4H as a tandem repeat downstream of the original element. Gene names with a (t) suffix are truncated relative to the full length shown for pAR060302. H1 and H2 refer to hypothetical open reading frames.