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The more accurate explanation is sequencing

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Because of its notably longer biological half-life compared to endogenous LH, researchers can study sustained receptor activation and profoundly prolonged endocrine responses

PMID 10781032

Additionally, reduced expression of glial fibrillary acidic protein (GFAP) and lonized calcium-binding adapter molecule 1 (Iba-1) in glial cells was observed, indicating decreased inflammatory responses

DSIP Delta Sleep-Inducing Peptide is naturally produced in the brain and plays a direct role in sleep architecture