Main Reaction: 5,6,7,8-tetrahydrofolate + histidine >> N5-formiminotetrahydrofolate

Reference: PubMed ID: 18941301
Authors: Kikuchi G, Motokawa Y, Yoshida T, Hiraga K
Title: Glycine cleavage system: reaction mechanism, physiological significance, and hyperglycinemia.
Published: 2008

5,6,7,8-tetrahydrofolate + histidine --> N5-formiminotetrahydrofolate