Pharmacology deals with the elucidation of cellular and organismal function in relation to bioactive chemicals.
Jiuchengia longoccipita is a coccosteid arthrodire placoderm from the Late Emsian epoch of Wuding , Yunnan .. Emsian. Emsian. coccosteid. coccosteid. arthrodire. arthrodire. placoderm. placoderm. epoch. Epoch ( geology ). Yunnan. Yunnan. Its skull is similar in form to those of Watsonosteus and Dickosteus , though J. longoccipita can be easily distinguished from them in that its skull is longer , and has anatomical features in common with homostiids .. Watsonosteus. Watsonosteus. Dickosteus. Dickosteus