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Promrat K, Kleiner DE, Niemeier HM, et al
The half-life of GIP and bioactive GLP-1 is only a few minutes because they are inactivated by the enzyme dipeptidyl peptidase 4
Raun et al., 1998 European Journal of Endocrinology Researchers tested different peptides to see how strongly (and selectively) they stimulated GH release
This integrative role connects it to chronobiology research rather than isolated sleep studies
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