A process in which a protein is transported to, or maintained in, a location within a microvillus. [ GOC:TermGenie GOC:kmv http://www.ncbi.nlm.nih.gov/pubmed/25335890 http://purl.obolibrary.org/obo/go/references/0000087 ]
Synonyms: protein localisation in microvillus protein localisation to microvillus protein localization in microvillus