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In cases where compounds are highly toxic to bacteria (e.g., some antibiotics), the bacterial reverse mutation (Ames) test should still be carried out, just as cytotoxic compounds are tested in mammalian cells, because mutagenicity can occur at lower, less toxic concentrations

The concept that binding proteins existed for peptide hormones like the IGFs, similar to those for steroid and thyroid hormones, were suggested by studies from Zapf and Froesch (12) and by Hintz (13), demonstrating that NSILA was present in high molecular weight complexes in serum

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This specific sequence confers on the peptide a strong, stable affinity for copper, which researchers cite as the basis for its classification as a copper-peptide complex rather than a standalone peptide