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TEM autoradiographs of pine tracheids treated with [3H]Phe and either an inhibitor of protein synthesis (cycloheximide [CH]) or an inhibitor of phenylpropanoid metabolism (PA). Silver grains indicating sites of incorporation of radioactive phenylpropanoid are most abundant over the secondary cell wall (CW) but are also associated with the Golgi (G) in control and PA samples. Label over vacuole (V) is relatively low. PM, Plasma membrane.
