Table 1. List of bitter compounds and concentrations (mM) used in this study.

Bitter compounds	2-bottle choice test	CTA	Long-term exposure
l-Tryptophan	1–60	50	N.A.
l-Isoleucine	1–300	200	N.A.
Denatonium benzoate	0.03–3	0.3	0.3
Quinine-HCl	0.001–1	0.03	0.03
Caffeine	0.3–50	5	3
Salicin	1–100	50	50
Epigallocatechin gallate	0.01–10	1	1

N.A., not applicable.