Enables RNA binding activity. Acts upstream of or within several processes, including male gonad development; meiotic nuclear division; and miRNA metabolic process. Located in P-body and nucleus. Part of RISC complex. Is expressed in several structures, including brain; lung; neural tube; tooth; and vibrissa. Orthologous to human AGO4 (argonaute RISC component 4). [provided by Alliance of Genome Resources, Apr 2022]