( It ( ( is ( ( ( this ( tiny space ) ) ( between ( the ( two cells ) ) ) ) ( that ( is ( referred ( to ( as ( a synapse ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT this) (JJ tiny) (NN space)) (PP (IN between) (NP (DT the) (CD two) (NNS cells))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN referred) (PP (TO to) (NP (RB as) (DT a) (NN synapse))))))))) (. .)))
It is this tiny space between the two cells that is referred to as a synapse .
(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.