DSIP is the abbreviation for delta sleep-inducing peptide. It is a nonapeptide with the amino acid sequence Тrр-Аlа-Gly-Gly-Asp-Ala-Ser-Gly-Glu. In 1964, M. Monnier and L. Hösli reported that DSIP enhanced delta (slow-wave) electroencephalogram patterns in rabbits—hence its name. However, it is the subject of much controversy because it has not been associated with a gene, and it may not exist in nature except under artificially induced conditions.
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