Fig. 1. LC-MS/MS chromatograms of pal-KTTKS (m/z 802.3→129.0) and pal-AA as IS (m/z 415.3→239.1) spiked with the dermal skin extract of hairless mouse before (A) and after (B) incubation in the dermal skin extract for 60 min at 37°C.
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