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