1BET:
reference: New protein fold revealed by a 2.3-A resolution crystal structure of nerve growth factor., McDonald NQ, Lapatto R, Murray-Rust J, Gunning J, Wlodawer A, Blundell TL, Nature 1991 Dec 5;354(6352):411-4. PMID: 1956407

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