RNA-binding protein. Interacts with FMR1 (By similarity). Interacts with FXR1 (By similarity). Interacts with TDRD3 (By similarity). Interacts with HABP4 (By similarity). Interacts with CYFIP2 but not with CYFIP1 (PubMed:11438699). The tandem Agenet-like domains preferentially recognize trimethylated histone peptides. Belongs to the FMR1 family.