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There is no fixing a wrong concentration after the fact

Since NDMA was already extensively investigated in various genotoxicity and mutagenicity assays and showed positive results in different in vitro comet assay studies, this substance was selected as the NA positive control for the present investigations

Pharmacology and physiology of gastrointestinal enteroendocrine cells

doi: 10.1186/1471-2199-13-16 14 HuangCWangYLiXRenLZhaoJHuYet al

87 M., Pliny Naturalis historia XVI 37, CIL VI 452)
A: B12 toxicity is extremely rare because excess amounts are eliminated through urine
