6NMW:
reference: Crystal structure of the SH3 domain of human Lyn non-receptor tyrosine kinase., Berndt S, Gurevich VV, Iverson TM, PLoS One. 2019 Apr 10;14(4):e0215140. doi: 10.1371/journal.pone.0215140., eCollection 2019. PMID: 30969999

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