( Protein ( ( has ( ( four calories ) ( of ( energy ( per gram ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Protein)) (VP (VBZ has) (NP (NP (CD four) (NNS calories)) (PP (IN of) (NP (NP (NN energy)) (PP (IN per) (NP (NN gram))))))) (. .)))
Protein has four calories of energy per gram.
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NNS proteins)))) (VP (VBZ provides) (NP (NP (CD four) (NNS calories)) (PP (IN of) (NP (NN energy))))) (. .)))