( ( Endothelial cells ) ( ( ( ( are ( found ( ( lining ( all ( blood vessels ) ) ) ( in ( the body ) ) ) ) ) and ) ( ( play ( several ( important roles ) ) ) ( in ( the ( cardiovascular system ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Endothelial) (NNS cells)) (VP (VP (VBP are) (VP (VBN found) (S (VP (VBG lining) (NP (DT all) (NN blood) (NNS vessels)) (PP (IN in) (NP (DT the) (NN body))))))) (CC and) (VP (VBP play) (NP (JJ several) (JJ important) (NNS roles)) (PP (IN in) (NP (DT the) (JJ cardiovascular) (NN system))))) (. .)))
Endothelial cells are found lining all blood vessels in the body and play several important roles in the cardiovascular system.
(ROOT (S (NP (DT The) (JJ cardiovascular) (NN system)) (VP (VBZ transports) (NP (JJ many) (NNS substances)) (PP (TO to) (CC and) (IN from) (NP (NP (NNS cells)) (PP (IN throughout) (NP (DT the) (NN body)))))) (. .)))