Table 1.

Chemotactic responses of classical V. cholerae strains: O395N1 carrying pAH901 (Che⁺), Vmlp24 carrying pAH901 (Δmlp24), and Vmlp24 carrying pMlp24 (Δmlp24/pMlp24)

Amino acid	No. of cells in the capillary with 10 mM amino acid (×105)a
	Che+b	Δmlp24c	Δmlp24/ pMlp24d
Serine	855 ± 174*	479 ± 77*	934 ± 68**
Glycine	586 ± 74**	239 ± 52**	633 ± 113**
Alanine	541 ± 42**	221 ± 60**	700 ± 16**
Cysteine	522 ± 97*	149 ± 22**	605 ± 18**
Arginine	504 ± 45**	203 ± 41**	184 ± 45
Asparagine	427 ± 60**	168 ± 29**	638 ± 30**
Histidine	370 ± 96*	65 ± 19**	333 ± 48**
Threonine	344 ± 24**	53 ± 6**	459 ± 51**
Lysine	328 ± 63*	131 ± 11**	394 ± 60**
Glutamine	323 ± 40**	103 ± 75*	350 ± 89**
Proline	322 ± 5**	91 ± 17**	557 ± 32**
Methionine	288 ± 84*	154 ± 48	413 ± 47**
Valine	253 ± 17**	184 ± 67	405 ± 71*
Phenylalanine	154 ± 47*	41 ± 5	289 ± 11**
Glutamic acid	137 ± 37**	96 ± 33	104 ± 59
Aspartic acid	120 ± 35*	214 ± 36	135 ± 50
Leucine	111 ± 23*	112 ± 12	347 ± 142
Tryptophan	103 ± 19*	74 ± 10	60 ± 28
Isoleucine	101 ± 22*	81 ± 21	295 ± 94*
Tyrosine	68 ± 22	38 ± 13	213 ± 18**
None	28 ± 2	22 ± 14	16 ± 4

^aMeans ± standard deviations of triplicate data are shown.

^bValues significantly higher than that of “none” at a P value of <0.05 (*) or <0.01 (**) in the t test are marked.

^cFor each amino acid, values were tested in comparison with those of “Che⁺” and are marked if they are significantly lower at a P value of <0.05 (*) or <0.01 (**) in the t test.

^dFor each amino acid, values were tested in comparison with those of “Δmlp24” and are marked if they are significantly higher at a P value of <0.05 (*) or <0.01 (**) in the t test.