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