{HEAD ~ Complex tissues} of finite life span will require {TAIL ~ cryopreservation} to expand product availability and utility 
require
{ HEAD ~ Complex tissues } of finite life span will require { TAIL ~ cryopreservation } to expand product availability and utility
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH