Glossary

Histidine

Histidine (three-letter code His, one-letter code H) is an amino acid with an imidazole side chain whose pKa near 6 allows it to be either neutral or positively charged under laboratory conditions. Histidine binds metal ions, such as copper in GHK-Cu, and is particularly prone to racemisation during coupling.

Source: en.wikipedia.org

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