{HEAD ~ Our continuous studies} were allowed to achieve {TAIL ~ the long lasting effect} in vivo by conversion of sulfhydryl group into disulfide group 
allowed to achieve
{ HEAD ~ Our continuous studies } were allowed to achieve { TAIL ~ the long lasting effect } in vivo by conversion of sulfhydryl group into disulfide group
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH