FIG. 1.

(A) Diagram of the chromosomal mercury resistance determinant of B. cereus RC607 showing the two determined O/P regions, the names of the genes, and the sizes of the gene products in amino acids (aa). The locations of the two oligonucleotide primers used for RT-PCR analysis and the three mRNA transcripts are shown. (B) DNA sequence of the region between merA and merB1 (as shown in panel A), with 100 nt per line, showing the newly completed region between the end of the sequence with GenBank accession no. M22708 and the start of the sequence with accession no. M22709. The final amino acid translation and termination codon of merA, the amino acid translation sequences of the new MerR2 and MerB2 protein products, and the first six amino acids of MerB1 are shown. The +1 first mRNA position for O/P2 is marked, and the positions of the four oligomer primers used for sequencing are boxed.