Purity > 90% as determined by SDS-PAGE. MW: 65.4kDa. Full Length of Mature Protein: 2-561aa. N-terminal 6xHis-tagged. Mus musculus (Mouse). Only known pyridoxal phosphate-dependent enzyme that contains heme. Important regulator of hydrogen sulfide, especially in the brain, utilizing cysteine instead of serine to catalyze the formation of hydrogen sulfide. Hydrogen sulfide is a gastratransmitter with signaling and cytoprotective effects such as acting as a neuromodulator in the brain to protect neurons against hypoxic injury