several labeled neurotransmitter substances or precursors ( [ 3h ] histamine , [ 3h ] serotonin , and [ 3h ] choline ) were injected with pressure into the cell body of c2 , an identified putative histaminergic neuron in the cerebral ganglion of aplysia in order to study the selectivity of axonal transport .
C0599444
cell body
C0027882
neuron