2SPG:
reference: Quantitative and qualitative analysis of type III antifreeze protein structure and function., Graether SP, DeLuca CI, Baardsnes J, Hill GA, Davies PL, Jia Z, J Biol Chem 1999 Apr 23;274(17):11842-7. PMID: 10207002

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