Fig. 2.
Collision-induced dissociation spectra of 1,25-(OH)2 D3 ((M + H-H2O)+ at m/z 399, top spectrum) and PTAD-derivatized 1,25-(OH)2 D3 (M + CH3NH+3 at m/z 623, bottom spectrum). The transition m/z 623 → 314 was utilized for MRM
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