( ( Flavoproteins ( in ( anaerobic respirers ) ) ) ( ( can ( generate ( oxygen radicals ) ) ) . ) )
(ROOT (S (NP (NP (NNS Flavoproteins)) (PP (IN in) (NP (JJ anaerobic) (NNS respirers)))) (VP (MD can) (VP (VB generate) (NP (NN oxygen) (NNS radicals)))) (. .)))
Flavoproteins in anaerobic respirers can generate oxygen radicals.
(ROOT (S (NP (JJ Anaerobic) (NN respiration)) (VP (VBZ occurs) (SBAR (IN if) (S (NP (NN oxygen)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN obtained) (PP (IN at) (NP (DT a) (JJ sufficient) (NN rate))))))))) (. .)))