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The peptide becomes biologically inactive, and you cannot tell from looking at it

Throughout the world, methylene blue is currently approved for the treatment of numerous conditions, of which include acquired and hereditary methemoglobinemia, preventing ifosfamide-induced encephalopathy in cancer patients, preventing urinary tract infections, visualizing nerves and endocrine glands during surgical procedures, and sterilizing blood prior to transfusions 3

This identification was published in 1973 and represents the foundational paper of the GHK research literature

(the enzyme that actually uses glutathione to neutralize free radicals)

Viability of spheroids were determined using CellTiter-Glo 3D cell viability assay kit (Promega)