Table 1.

Serum l-Trp and l-KYN concentrations and the ratio (mean ± S.E.) in male or female subjects determined by the proposed LC-MS method.

	Total (n = 19)	Male (n = 8)	Female (n = 11)
l-Trp (μM)	86.13 ± 4.12	95.65 ± 4.27	79.20 ± 3.34*
l-KYN (μM)	1.84 ± 0.15	2.08 ± 0.17	1.66 ± 0.13
l-KYN/l-Trp (×10−2)	2.15 ± 0.17	2.12 ± 0.11	2.17 ± 0.21

Note:

^*P < 0.05 versus male.