( ( A synapse ) ( ( is ( ( a connection ) ( between ( ( ( a neuron ) and ) ( ( another neuron ) ( -LRB- ( or ( ( muscle cell ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN synapse)) (VP (VBZ is) (NP (NP (DT a) (NN connection)) (PP (IN between) (NP (NP (DT a) (NN neuron)) (CC and) (NP (NP (DT another) (NN neuron)) (PRN (-LRB- -LRB-) (CC or) (NP (NP (NN muscle)) (NP (NN cell))) (-RRB- -RRB-))))))) (. .)))
A synapse is a connection between a neuron and another neuron (or muscle cell).
(ROOT (S (NP (DT The) (DT the) (NN synapse)) (VP (VBZ is) (NP (NP (DT the) (NN space)) (PP (IN between) (NP (NP (DT a) (NN neuron)) (CC and) (NP (DT the) (JJ next) (NN cell)))))) (. .)))
The the synapse is the space between a neuron and the next cell.