5YDN:
reference: Three-dimensional structures of bacteriophage neck subunits are shared in Podoviridae, Siphoviridae and Myoviridae., Iwasaki T, Yamashita E, Nakagawa A, Enomoto A, Tomihara M, Takeda S, Genes Cells. 2018 May 16. doi: 10.1111/gtc.12594. PMID: 29767456

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