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. Author manuscript; available in PMC: 2014 Feb 23.
Published in final edited form as: J Pharm Biomed Anal. 2012 Nov 15;74:291–297. doi: 10.1016/j.jpba.2012.10.033

Fig. 2.

Fig. 2

LC/MS chromatogram of heroin, 6-MAM, and morphine with internal standards. 80ng/mL of each analyte was spiked into rat plasma before extraction and analysis.