May be involved in pre-mRNA splicing (By similarity). Required for embryonic development and survival. Identified in the spliceosome C complex (By similarity). Can assemble into large rod-like polymers. Detected in muscle cells from body, pharynx and vulva, in neurons from head and tail, in pharyngeal gland and in tail hypodermal cells. Detected in oocyte, embryo, larval stage 1 to 4, and in adult. Belongs to the TFP11/STIP family.