( ( ( The ( first step ) ) ( in ( ( cellular respiration ) ( in ( all ( living cells ) ) ) ) ) ) ( ( is ( ( glycolysis , ) ( which ( can ( ( take place ) ( without ( ( the presence ) ( of ( molecular oxygen ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ first) (NN step)) (PP (IN in) (NP (NP (JJ cellular) (NN respiration)) (PP (IN in) (NP (DT all) (VBG living) (NNS cells)))))) (VP (VBZ is) (NP (NP (NNS glycolysis)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB take) (NP (NN place)) (PP (IN without) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (JJ molecular) (NN oxygen))))))))))) (. .)))
The first step in cellular respiration in all living cells is glycolysis , which can take place without the presence of molecular oxygen.
(ROOT (S (NP (NNS Glycolysis)) (VP (VBZ is) (NP (NP (DT the) (JJ first) (NN stage)) (PP (IN of) (NP (JJ cellular) (NN respiration))))) (. .)))