TABLE 2.

K_d value between various neurotransmitters and polySia

Neurotransmitters and their precursors	Kd (m)
Catecholamine
Tyrosine	—a
Dopamine	17.9 × 10−6 ± 0.4 × 10−6
Norepinephrine	11.3 × 10−6 ± 0.3 × 10−6
Epinephrine	12.7 × 10−6 ± 0.6 × 10−6
Histamine
Histidine	—
Histamine	—
Serotonin
Tryptophan	—
Serotonin	—

^a —, K_d value could not be measured because of weak interaction.