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Left boundary of 5′-CS for MUL2G8, MUL2G9, and MUL2G11. The 25-base sequence comprising IRi in MUL2G11 and previously described class 1 integrons is shown in boldface type and identifies the outer boundary of the 5′-CS, as previously defined. Dots indicate positions of sequence identity with MUL2G11. The vertical arrow indicates the point of insertion of ISPa7 in some class 1 integrons. The underlined three bases are the stop codon (complementary strand) for intI1.
