That reference discloses that {HEAD ~ ornithine decarboxylase activity} increased {TAIL ~ precedent} to polyamine biosynthesis 
increased
That reference discloses that { HEAD ~ ornithine decarboxylase activity } increased { TAIL ~ precedent } to polyamine biosynthesis
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH