( ( 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 (PRP You)) (VP (VBP call) (NP (NP (NNS prokaryotes)) (SBAR (WHNP (WDT that)) (S (VP (VBP do) (RB not) (VP (VB need) (NP (NN oxygen)) (PP (IN for) (NP (NN respiration) (NN anaerobic))))))))) (. .)))