Under {HEAD ~ these conditions cells} extend neurites, develop electrical excitability and express {TAIL ~ genes} encoding neuronal cell specific proteins  
Under { HEAD ~ these conditions cells } extend neurites , develop electrical excitability and express { TAIL ~ genes } encoding neuronal cell specific proteins
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH