Total RNA was isolated using TRIzol Reagent (Thermo Fisher) according to the manufacturer's protocol. cDNA was synthesized with M-MuLV Reverse Transcriptase (New England Biolabs, Ipswich, MA) as described previously.18 (link) Quantitative real-time polymerase chain reaction (qRT-PCR) was conducted on LightCycler 96 (Roche, Basel, Switzerland) using PerfeCTa qPCR FastMix II (Quantabio, Beverly, MA) according to the manufacturer's protocol. PrimeTime qPCR Assay probes specific for human SULT2B1b (Hs.PT.58.22508626) or for mouse Sult2b1 (Mm.PT.58.5982373) (Integrated DNA Technologies, Skokie, IL) were used and the transcript levels were normalized using TaqMan Ribosomal RNA Control Reagents (Thermo Fisher).