1U9K:
reference: Crystal structure of mouse triggering receptor expressed on myeloid cells 1 (TREM-1) at 1.76 A., Kelker MS, Debler EW, Wilson IA, J Mol Biol 2004 Dec 10;344(5):1175-81. PMID: 15561137

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