IgA antibodies are better than IgG at protecting macaques from mucosal challenge ( HGN194) https://www.iavireport.org/easyblog/entry/iga-antibodies-are-better-than-igg-at-protecting-macaques-from-mucosal-challenge https://absoluteantibody.com/product/anti-hiv-1-gp120-hgn194/ https://www.ncbi.nlm.nih.gov/pubmed/20098712 HGN194 that targets the conserved V3 loop crown https://www.mdpi.com/2076-393X/7/4/194