Figure 3From: Abnormal nociception and opiate sensitivity of STOP null mice exhibiting elevated levels of the endogenous alkaloid morphine Characterization of morphine in mouse brain extracts. Morphine qualification was performed in selected reaction monitoring (SRM) mode with the following transitions: m/z 286.2 → 165.1 (see also additional file 1). SRM trace of the specific transition for morphine in A: standard samples of morphine (50, 100, 500 and 1000 fmol); B: WT brain animals and C: STOP null brain animals.Back to article page