Figure 1.

Representative ultra-performance liquid chromatography and quadrupole time-of-flight tandem mass spectrometry (UPLC/Q-TOF MS/MS)-based peak intensity chromatogram of rat urine in electrospray ionization (ESI) negative ion mode. (A) Rat on normal-calcium diet; (B) rat on low-calcium diet. BPI, baseline peak intensity.

Wang et al. BMC Medicine 2013 11:86   doi:10.1186/1741-7015-11-86
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