. 2018 Jul 24;7(6):1164–1172. doi: 10.1039/c8tx00042e

Table 2. Baseline data of urine metabolites of healthy pregnant women involved in panel regression analysis.

HMDB ID	Metabolite name	Primary ID in T1 ^a	Primary ID in T2 ^a	Primary ID in T3 ^a	Adduct ion	Metabolic pathway
HMDB04225	2-Oxoarginine	4.09_347.168	4.09_347.169	4.09_347.169	[2M + H]⁺	Arginine and proline metabolism
HMDB06524	3-Indoleacetonitrile	2.09_157.077	2.11_157.078	2.13_157.078	[M + H]⁺	Tryptophan metabolism
HMDB00738	Indole	0.51_156.020	0.51_156.021	0.51_156.020	[M + K]⁺	Tryptophan metabolism
HMDB06779	Indole-5,6-quinone	0.88_148.040	0.88_148.041	0.89_148.040	[M + H]⁺	Tyrosine metabolism
HMDB01180	N2-Succinyl-l-glutamic acid 5-semialdehyde	5.02_463.157	5.02_463.157	5.03_463.156	[2M + H]⁺	Arginine and proline metabolism
HMDB00562	Creatinine	0.54_227.126	0.54_227.126	0.54_227.126	[2M + H]⁺	Arginine and proline metabolism
HMDB04370	N-Methyltryptamine	3.03_175.123	3.04_175.124	3.05_175.124	[M + H]⁺	Tryptophan metabolism
HMDB12267	N-Succinyl-l,l-2,6-diaminopimelate	6.16_291.121	6.17_291.122	6.18_291.122	[M + H]⁺	Lysine metabolism

^aValues are presented as retention time (minute)_mass (Da); T1, T2 and T3 denote the first trimester, the second trimester and the third trimester, respectively.