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313 High expression of claudin-2, a tight junction protein, can increase the permeability of the intestinal barrier and disrupt its structure

Its first residue is glutamic acid, its middle residue is aspartic acid and its final residue is arginine

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A copper peptide serum may look good in a sample bottle, but it still requires stability testing, packaging compatibility testing, microbiology testing, and careful marketing claims before it can become a serious retail product