1L0Q:
reference: Archaeal surface layer proteins contain beta propeller, PKD, and beta helix domains and are related to metazoan cell surface proteins., Jing H, Takagi J, Liu JH, Lindgren S, Zhang RG, Joachimiak A, Wang JH, Springer TA, Structure (Camb) 2002 Oct;10(10):1453-64. PMID: 12377130

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