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It was originally isolated in 1977 from the cerebral venous blood of rabbits and has since been found to be present in small amounts in human brains and plasma, with higher concentrations later in the day.3 4 It, or a similar substance, is also present at higher concentrations in human breast milk.5 Because DSIP can cross the blood-brain barrier and is easily absorbed via the gut (unusual for a peptide), some researchers have hypothesized that it may facilitate post-feeding sleep tendencies among newborns, though it remains unclear whether DSIP truly has a hand in neonate sleep-wake cycles.4 5 6 Its mechanism of action is likewise unclear, but it may have something to do with endocrine regulation
J Am Chem Soc 95:69446948 Furne J, Saeed A, Levitt MD (2008) Whole tissue hydrogen sulphide concentrations are orders of magnitude lower than presently accepted levels
Fragments per kilobase of transcript per million mapped reads (FPKM) normalization of DEseq2 reads was used for z -score heat maps
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