The structures of {HEAD ~ bone} are useful for providing {TAIL ~ living cells} and tissues as well as biologically active molecules to subjects 
The structures of { HEAD ~ bone } are useful for providing { TAIL ~ living cells } and tissues as well as biologically active molecules to subjects
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH