1DOK: Monocyte Chemoattractant Protein 1, P-Form
reference: The structure of MCP-1 in two crystal forms provides a rare example of variable quaternary interactions., Lubkowski J, Bujacz G, Boque L, Domaille PJ, Handel TM, Wlodawer A, Nat Struct Biol 1997 Jan;4(1):64-9. PMID: 8989326

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