( ( ( The heart ) ( of ( a mammal ) ) ) ( ( consists ( of ( four chambers ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN heart)) (PP (IN of) (NP (DT a) (NN mammal)))) (VP (VBZ consists) (PP (IN of) (NP (CD four) (NNS chambers)))) (. .)))
The heart of a mammal consists of four chambers.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS chambers)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))