{HEAD ~ A TSG6 polypeptide} can be delivered by {TAIL ~ a controlled release} or sustained release system 
delivered by
{ HEAD ~ A TSG6 polypeptide } can be delivered by { TAIL ~ a controlled release } or sustained release system
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH