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A reputable supplier should be willing to publish or provide third-party COAs (Certificates of Analysis) for each batch

DNA damage triggers a prolonged p53-dependent G1 arrest and long-term induction of Cip1 in normal human fibroblasts

It interacts with enzymes such as neutral endopeptidase and aminopeptidase N, which influence peptide metabolism in tissues

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10.1021/acs.nanolett.0c02463 171 RuanC.WangC.GongX.ZhangY.DengW.ZhouJ.et al (2021)