TABLE 2.

Unit transposons^a

Transposon	Family	Associated resistance(s)	Determinant(s)	TDb (bp)
Tn551	Tn3	MLS	ermB	5
Tn1546		Vancomycin/teicoplanin	vanHAX	5
Tn552c	Tn7	Penicillins	blaZ	6/7
Tn5404		Streptomycin	aadE	6
				Kanamycin/neomycin	aphA-3
				Streptothricin	sat4
Tn554d	Tn554	MLS	ermA	Absent
			Spectinomycin	spc
ψTn554		Cadmium	cadA	Absent
Tn558		Chloramphenicol/florfenicol	fexA	Absent
Tn559		Trimethoprim	dfrK	Absent
Tn5406		Streptogramin A/pleuromutilins/lincosamides	vga(A)v	Absent
Tn6133		MLS	ermA	Absent
				Spectinomycin	spc
				Streptogramin A/pleuromutilins/lincosamides	vga(E)

^a See Paulsen et al. (25), Firth and Skurray (26), and the text for references.

^b TD, target duplication.

^c Tn3852, Tn4002, and Tn4201 are likely to be similar or identical to Tn552.

^d Tn3853 is likely to be similar or identical to Tn554.