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The genetic environment surrounding blaCTX-M genes located on the chromosome. The maximum likelihood tree was built based on the alignment of 5000 bp fragments contain insert sequence and blaCTX-M gene extract from the chromosome. The gene annotation and direction were generated by the RAST server and further corrected with NCBI blast. The conversed gene cluster contains ISEcp1, blaCTX-M-15, and WubC family metalloprotein.
