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For example, the interaction of GABA secreted by B cells is thought to limit the CD8+ T cells in the vicinity

The KTTKS sequence is derived from the C-terminal propeptide of type I procollagen and acts as a matrikine -- a peptide fragment that signals cells to produce new extracellular matrix components

Li et al., 2012), but changes in collagen I expression are inconsistent (Wuertz et al., 2008

Amycretin is a unimolecular dual agonist -- a single molecule that activates both GLP-1 and amylin receptors -- available in both injectable and oral formulations

While the research is promising, I always remind my clients that large-scale human clinical trials are still catching up to what we're seeing in practice for many of these peptides