( ( ( ( The ( four valves ) ) ( of ( the heart ) ) ) ( -LRB- ( ( pictured ( at left ) ) -RRB- ) ) ) ( ( are ( ( ( ( ( ( ( ( the ( tricuspid valve ) ) , ) ( the ( pulmonary valve ) ) ) , ) ( the ( mitral valve ) ) ) , ) and ) ( the ( aortic valve ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (CD four) (NNS valves)) (PP (IN of) (NP (DT the) (NN heart)))) (PRN (-LRB- -LRB-) (VP (VBN pictured) (PP (IN at) (NP (NN left)))) (-RRB- -RRB-))) (VP (VBP are) (NP (NP (DT the) (JJ tricuspid) (NN valve)) (, ,) (NP (DT the) (JJ pulmonary) (NN valve)) (, ,) (NP (DT the) (JJ mitral) (NN valve)) (, ,) (CC and) (NP (DT the) (JJ aortic) (NN valve)))) (. .)))
The four valves of the heart (pictured at left) are the tricuspid valve, the pulmonary valve, the mitral valve, and the aortic valve.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))