The history of cryopreservation of biological material, however, has shown that {HEAD ~ the optimization} of {TAIL ~ a cryopreservation protocol} for a particular cell does not necessarily give good results when used with another cell type or with other cells in a tissue 
The history of cryopreservation of biological material , however , has shown that { HEAD ~ the optimization } of { TAIL ~ a cryopreservation protocol } for a particular cell does not necessarily give good results when used with another cell type or with other cells in a tissue
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