Table 3.

Compounds misclassified according to q⁻.

No.	Compound	KDa	NCarboxylb	NCarbon
4	β-Alanine		1
5	l-α-Aminoadipatec		2	4
8	γ-Amino-n-butyrate		1
22	Fumarate	3.E−4	2	2
24	l-Homocysteine		1
27	dl-Threo-β-hydroxyaspartate	1.E−4	2	2
33	l-Malate	6.E−4	2	2
36	dl-β-Methylaspartate	3.E−4	2	2
38	dl-α-Methylglutamatec		2	3
42	2-Methylsuccinate	5.E−3	2	2
52	Succinate	2.E−3	2	2

Compounds with blank values are non-attractants.

^aApparent dissociation constant calculated from the concentration of the ligand required to induce a response by wild-type E. coli (Mesibov and Adler, 1972).

^bNumber of carboxyl groups on the compounds.

^cCompounds for which the number of carbon atoms N_Carbon > 2.