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