Figure 2.

A chromatogram of a serum standard containing 50 ng/ml naltrexone (RT = 6.99) and 6-β- naltrexol (RT = 6.20), nalorphine (RT = 5.13) as internal standard.

Heinälä et al. BMC Research Notes 2012 5:439   doi:10.1186/1756-0500-5-439
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