Table 1.

Tissue concentrations of 5-HT in mouse mammary glands

Mice	Tissue (5-HT), ng/g tissue	P value vs. control
Control	36.60 ± 0.50 (2)	—
Lactating	99.82 ± 12.79 (6)	<0.05
5-HTP-treated	194.70 ± 26.10 (2)	<0.01

Extracts from mammary glands of normal virgin control, days 10–11 lactating, and 100 mg/kg body weight 5-HTP-injected female mice were assayed by HPLC/EC. Values are expressed as means ± SE relative to tissue wet weights. Data were compared by ANOVA, with Newman–Keuls test for differences among means.