Protein hormones are fractionated and isolated from {HEAD ~ extracts} of pituitary glands or {TAIL ~ tissues} 
of
Protein hormones are fractionated and isolated from { HEAD ~ extracts } of pituitary glands or { TAIL ~ tissues }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL