4G0Y:
reference: Arabidopsis Argonaute MID domains use their nucleotide specificity loop to sort small RNAs., Frank F, Hauver J, Sonenberg N, Nagar B, EMBO J. 2012 Jul 31. doi: 10.1038/emboj.2012.204. PMID: 22850669

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