( ( ( Low levels ) ( of oxygen ) ) ( ( can ( ( ( lead ( to ( cell death ) ) ) , ) ( including ( cells ( in ( ( the ( vital organs ) ) ( such ( as ( ( ( the brain ) and ) heart ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Low) (NNS levels)) (PP (IN of) (NP (NN oxygen)))) (VP (MD can) (VP (VB lead) (PP (TO to) (NP (NN cell) (NN death))) (, ,) (PP (VBG including) (NP (NP (NNS cells)) (PP (IN in) (NP (NP (DT the) (JJ vital) (NNS organs)) (PP (JJ such) (IN as) (NP (NP (DT the) (NN brain)) (CC and) (NP (NN heart)))))))))) (. .)))
Low levels of oxygen can lead to cell death, including cells in the vital organs such as the brain and heart.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN cell)) (VP (VBZ is) (NP (NP (DT the) (JJS lowest) (NN level)) (PP (IN of) (NP (NN organism))) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB perform) (NP (NP (DT all) (NNS activities)) (VP (VBN required) (PP (IN for) (NP (NN life))))))))))) (. .)))