{TAIL ~ The retinoic acid} like activity of {HEAD ~ these compounds} is confirmed through the classic measure of retinoic acid activity involving the effects of retinoic acid on ornithine decarboxylase 
{ TAIL ~ The retinoic acid } like activity of { HEAD ~ these compounds } is confirmed through the classic measure of retinoic acid activity involving the effects of retinoic acid on ornithine decarboxylase
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH