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D2 does the same thing as D1
By binding its receptor, GIP increases post-meal insulin and promotes fat storage
Understanding the brain uptake and permeability of small molecules through the BBB: a technical overview
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2 Challenges of developing an oral peptide therapy The oral administration of peptides is not a new concept, and the challenges faced are best illustrated by considering the failure to date to produce a marketable oral formulation of insulin since its discovery in 1921 [1, 2, 8, 40]
