FIG. 1.

Genetic maps of 10 Tn1546 types. The thick horizontal lines represent the different Tn1546 types. The positions of genes and open reading frames (orf1 and orf2) and the direction of transcription are depicted with open arrows. Dotted boxes represent IS elements. The positions of the first nucleotide upstream and the first nucleotide downstream from the IS insertion sites are depicted. Solid arrows indicate the transcriptional orientation of the inserted IS elements. Deletions (del) are indicated by dotted lines. The position of the base pair mutation at 8234, G→T (K→N), is indicated above the A5 and A6 Tn1546 types.