The invention includes the use of {HEAD ~ agitation} to enhance {TAIL ~ the penetration} of an effective amount of cryoprotectant 
The invention includes the use of { HEAD ~ agitation } to enhance { TAIL ~ the penetration } of an effective amount of cryoprotectant
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH