Extracted ion chromatograms of 26 unconjugated (a), 8 glycine-conjugated and 9 taurine-conjugated BAs (b), 5 taurine-sulfated, 5 glycine-sulfated, and 5 sulfated BAs (c), and 15 deuterium (D)-labeled BAs as Internal Standards (d). (1) UCA (2) 7,12-diketoLCA (3) DHCA (4) ω-MCA (5) α-MCA (6) 7-DHCA (7) β-MCA (8) γ-MCA (9) MDCA (10) 3-DHCA (11) alloCA (12) CA (13) UDCA (14) HDCA (15) 7-ketoLCA (16) 6,7-diketoLCA (17) norDCA (18) apoCA (19)12-ketoLCA (20) CDCA (21) DCA (22) isoalloLCA (23) isoDCA (24) isoLCA (25) LCA (26) 3-ketoLCA (27) T-α-MCA (28) T-β-MCA (29) GDHCA (30) THCA (31) TUDCA (32) THDCA (33) GHCA (34) TCA (35) GHDCA (36) GCA (37) GUDCA (38) TCDCA (39) TDCA (40) GDCA (41) GCDCA (42) TLCA (43) GLCA (44) TUDCA-3S (45) TCA-3S (46) GUDCA-3S (47) GCA-3S (48) TCDCA-3S (49) TDCA-3S (50) GCDCA-3S (51) GDCA-3S (52) TLCA-3S (53) UDCA-3S (54) CA-3S (55) GLCA-3S (56) CDCA-3S (57) DCA-3S (58) LCA-3S (IS1) TUDCA-3S-d4 (IS2) TCA-d4 (IS3) GDCA-3S-d4 (IS4) GUDCA-d4 (IS5) GCA-d4 (IS6) TCDCA-d5 (IS7) CDCA-3S-d4 (IS8) GDCA-d4 (IS9) GCDCA-d4 (IS10) CA-d4 (IS11) UDCA-d4 (IS12) GLCA-d4 (IS13) CDCA-d4 (IS14) DCA-d4 (IS15).