( ( After ( ( a neurotransmitter ) ( has ( ( its effect ) ( on ( the ( target neuron ) ) ) ) ) ) ) ( , ( it ( usually ( ( ( ( ( ( ( either ( ( diffuses away ) ( from ( the synapse ) ) ) ) , ) ( is ( deactivated ( by ( enzymes ( in ( the synapse ) ) ) ) ) ) ) , ) or ) ( is ( absorbed ( by ( surrounding cells ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN After) (S (NP (DT a) (NN neurotransmitter)) (VP (VBZ has) (NP (NP (PRP$ its) (NN effect)) (PP (IN on) (NP (DT the) (NN target) (NN neuron))))))) (, ,) (NP (PRP it)) (ADVP (RB usually)) (VP (VP (ADVP (RB either)) (VBZ diffuses) (ADVP (RB away)) (PP (IN from) (NP (DT the) (NN synapse)))) (, ,) (VP (VBZ is) (VP (VBN deactivated) (PP (IN by) (NP (NP (NNS enzymes)) (PP (IN in) (NP (DT the) (NN synapse))))))) (, ,) (CC or) (VP (VBZ is) (VP (VBN absorbed) (PP (IN by) (NP (VBG surrounding) (NNS cells)))))) (. .)))
After a neurotransmitter has its effect on the target neuron, it usually either diffuses away from the synapse, is deactivated by enzymes in the synapse, or is absorbed by surrounding cells.
(ROOT (S (NP (NNP Synapse)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT a) (NN connection)) (PP (IN between) (NP (NP (DT a) (NN neuron)) (CC and) (NP (PRP$ its) (NN target) (NN cell)))))))) (. .)))