In particular, neuronally differentiated PC12 cells, established from pheochromocytoma of {TAIL ~ rat adrenal medulla}, are used to host {HEAD ~ a persistent viral infection} 
In particular , neuronally differentiated PC12 cells , established from pheochromocytoma of { TAIL ~ rat adrenal medulla } , are used to host { HEAD ~ a persistent viral infection }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD