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Four of the five warning letters were to companies (specifically, Xcel Research, Prime Vitality, Summit Research Peptides, and Swisschem) that claimed to distribute GLP-1s for research use only in spite of ample evidence to the contrary

Ding et al., 2021)

Impact commentaries

At least 70 enzymes contain zinc, 15 are activated by zinc and, more importantly, almost all metabolic pathways require some zinc, e.g., carbonic anhydrase and carboxypeptidase A (pancreatic hexopeptidasa) require one molecule of zinc per mole of protein

Chromatin immunoprecipitation (ChIP) ChIP assay was performed as previously described with some modifications [48]