( ( A ( MEDICAL FACT ) ) ( ( At ( ( the ( precise moment ) ) ( of death ) ) ) ( ( ( the pupil ) ( of ( the eye ) ) ) ( ( opens ( its widest ) ) . ) ) ) )
(ROOT (S (NP (DT A) (NNP MEDICAL) (NNP FACT)) (PP (IN At) (NP (NP (DT the) (JJ precise) (NN moment)) (PP (IN of) (NP (NN death))))) (NP (NP (DT the) (NN pupil)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ opens) (NP (PRP$ its) (JJS widest))) (. .)))
A MEDICAL FACT At the precise moment of death the pupil of the eye opens its widest.
(ROOT (S (NP (DT The) (NN pupil)) (VP (VBZ is) (NP (NP (DT the) (NN opening)) (PP (IN in) (NP (NP (DT the) (NN front)) (PP (IN of) (NP (DT the) (NN eye))))))) (. .)))