Delta sleep-inducing peptide, abbreviated DSIP, is a neuropeptide that when infused into the mesodiencephalic ventricle of recipient rabbits induces spindle and delta EEG activity and reduced motor activities.
Its aminoacid sequence is Тrр-Аlа-Gly-Gly-Asp-Ala-Ser-Gly-Glu. However, it is the only neuropeptide in history whose gene is unknown, raising serious questions regarding the actual existence of this peptide in nature.
Read more about Delta Sleep-inducing Peptide: Discovery, Structure and Interactions, Function, Roles in Disease and Medicine