{HEAD ~ The amount} of reducing {TAIL ~ substance} and the period of time for interaction are so adapted to obtain the product desired, whereafter the blood and plasma, respectively, are optionally fractionated in a known manner 
{ HEAD ~ The amount } of reducing { TAIL ~ substance } and the period of time for interaction are so adapted to obtain the product desired , whereafter the blood and plasma , respectively , are optionally fractionated in a known manner
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH