Table 1.

Composition of solutions used for selectivity tests (refer to Figure 5D).

Individual Concentrations of Species ($\mathsf{\mu }$M)
Solution	Serine	Glycine	Acetylcholine
a	0.2	20	50
b	2	20	50
c	20	20	50
d	20	0.2	50
e	20	2	50
f	20	20	50
g	20	20	5
h	20	20	50
i	20	20	100