| Sections from all spinal cord levels from 20 human fetuses , age range 7 . 5 17 gestational weeks ( GW ) were immunostained for non phosphorylated neurofilaments ( to reveal motoneurones , spinocerebellar neurones and other large neurones ) , the calcium binding protein parvalbumin ( large proprioreceptive afferents ) , growth associated protein 43 kDa ( growing axons ) , glial fibrillary acidic protein ( radial glia ) , synaptophysin ( synaptic terminals ) the cell cell recognition molecule ephrin A 4 ( EphA 4 ) and the ETS transcription factor Er 81 ( subclasses of motoneurone and proprioreceptive neurone ) . ^^^ |