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UPLC-HRMS analysis of formic acid formed from 14α-CDO dihydrolanosterol by human P450 51A1 in an atmosphere of 18O2. The two frames show the 18O (m/z 169.0968) and 16O (m/z 167.0925) channels. All m/z values are calculated for the derivatized pyridyl formate esters. (The corresponding raw chromatographic traces are presented in Figure S3).
