Essential RNA-binding protein. May be required for circadian repression of eclosion. Also essential for nurse cell dumping during oogenesis, the process whereby the cytoplasmic contents of nurse cells are transferred to the oocyte late in it's development. The precise location within neurons varies according to the type of neuron, being cytoplasmic in CCAP neurons and nuclear in the CNS. Expressed in the CNS and in CCAP neurons of the ventral nervous system (VNS), which control insect ecdysis. Oscillates in abundance during the circadian cycle at the protein level; peaks during the subjective day.