( ( ( A ( Human Heart ) ) , ) ( showing ( all ( four chambers ) ) ) )
(ROOT (NP (NP (DT A) (NNP Human) (NNP Heart)) (, ,) (PP (VBG showing) (NP (DT all) (CD four) (NNS chambers)))))
A Human Heart, showing all four chambers
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS chambers)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))