hMLH1 and hMSH2 group probes. A: LG1, LG2, and LG3 represent the hMLH1 group 1, group 2, and group 3 probes, respectively. Open blocks represent the exons in the group probe. BamHI and NotI restriction enzymes located at both ends of the inserts were used to release the inserts. B: SG1, SG2, and SG3 are the hMSH2 group 1, group 2, and group 3 probes, respectively. Instead of the pcR2.1-TOPO vector, SG1 was subcloned into the pGEM-T easy vector and the SG1 probe was released by digestion with the NotI restriction enzyme.