Preferably the fluids contain blood or {HEAD ~ blood products} and comprise {TAIL ~ biologically active proteins} 
Preferably the fluids contain blood or { HEAD ~ blood products } and comprise { TAIL ~ biologically active proteins }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL