The goal of cryopreservation is to preserve the structural integrity and {TAIL ~ viability} of biological materials for an indefinite period of {HEAD ~ time} so that these materials can be available and used as needed 
The goal of cryopreservation is to preserve the structural integrity and { TAIL ~ viability } of biological materials for an indefinite period of { HEAD ~ time } so that these materials can be available and used as needed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH