TABLE 4.

Levels of polymorphism at MNR loci compared to non-SSR type loci among 27 E. coli strains^a

Polymorphic site	Locus	Length of sequence (bp)	No. of strains sequenced	MNR + flanking sequenceb		Flanking sequence onlyc		Microhaplotypes
				No. of polymorphic sites	Polymorphism level	No. of polymorphic sites	Polymorphism level	No. of microhaplotypes	Polymorphism level
MNR	yaiN	198	21	5	0.12	2	0.05	5	0.12
	ycqW	118	21	17	0.69	10	0.40	10	0.40
	b2345	128	26	11	0.33	6	0.18	11	0.33
	ykqE	90	25	6	0.27	5	0.22	6	0.27
	Mean ± SD				0.351 ± 0.015		0.214 ± 0.005		0.280 ± 0.004
Non-SSR	osmB	140	26	4	0.11	4	0.11	7	0.19
	qalS	120	27	1	0.03	1	0.03	3	0.09
	pepD	251	27	0	0.00	0	0.00	1	0.01
	Mean ± SD				0.047 ± 0.001		0.047 ± 0.001		0.100 ± 0.003
	Pd				0.046		0.053		0.036

^aNon-SSR loci were sequenced in a 27-strain panel; hence, the comparison to MNR loci was done for the same 27 strains.

^bMean number of polymorphic sites when the MNRs are considered as multiple sites.

^cMean number of polymorphic sites in sequences flanking the MNR.

^dOne-tailed P value (Student's t test) with unequal variances.