4WXG:
reference: Engineered L-Serine Hydroxymethyltransferase from Streptococcus thermophilus for the Synthesis of alpha,alpha-Dialkyl-alpha-Amino Acids., Hernandez K, Zelen I, Petrillo G, Uson I, Wandtke CM, Bujons J, Joglar J, Parella T, Clapes P, Angew Chem Int Ed Engl. 2015 Jan 21. doi: 10.1002/anie.201411484. PMID: 25611820

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).