( ( The retina ) ( ( contains ( ( ( ( rods and ) cones ) , ) ( ( photoreceptor neurons ) ( that ( synapse ( with ( bipolar cells ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN retina)) (VP (VBZ contains) (NP (NP (NNS rods) (CC and) (NNS cones)) (, ,) (NP (NP (NN photoreceptor) (NNS neurons)) (SBAR (WHNP (WDT that)) (S (VP (VBP synapse) (PP (IN with) (NP (NNP bipolar) (NNS cells))))))))) (. .)))
The retina contains rods and cones, photoreceptor neurons that synapse with bipolar cells.
(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.