1QP2:
reference: The solution structure of photosystem I accessory protein E from the cyanobacterium Nostoc sp. strain PCC 8009., Mayer KL, Shen G, Bryant DA, Lecomte JT, Falzone CJ, Biochemistry 1999 Oct 12;38(41):13736-46. PMID: 10521281

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