( ( ( primary ( cell ( culture models ) ) ) ( of ( neuronal ( process ( outgrowth ( and ( synapse formation ) ) ) ) ) ) ) . )
(ROOT (NP (NP (JJ primary) (NN cell) (NN culture) (NNS models)) (PP (IN of) (NP (JJ neuronal) (NN process) (NN outgrowth) (CC and) (NN synapse) (NN formation))) (. .)))
primary cell culture models of neuronal process outgrowth and synapse formation.
(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.