The function of Ensembl gene identifier ENSG00000089101 (CFAP61, cilia and flagella associated protein 61) is as follows. Involved in sperm flagellum assembly (PubMed:34792097, PubMed:35174165). Plays an essential role in the formation of the radial spokes in flagellum axoneme (By similarity). {ECO:0000250|UniProtKB:Q8CEL2, ECO:0000269|PubMed:34792097, ECO:0000269|PubMed:35174165}.