6LZ1:
reference: Cryo-EM structure of fission yeast tetrameric alpha-mannosidase Ams1., Zhang J, Wang YY, Du LL, Ye K, FEBS Open Bio. 2020 Sep 27. doi: 10.1002/2211-5463.12988. PMID: 32981237

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