( The ( ( structure ( that ( ( attaches ( a ( ( flagellum or ) cilium ) ) ) ( to ( a cell ) ) ) ) ) . ) )
(ROOT (NP (DT The) (NN structure) (SBAR (WHNP (WDT that)) (S (VP (VBZ attaches) (NP (DT a) (NN flagellum) (CC or) (NN cilium)) (PP (TO to) (NP (DT a) (NN cell)))))) (. .)))
The structure that attaches a flagellum or cilium to a cell.
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (NP (DT the) (NN sperm) (NN cell)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN cell)) (PP (IN with) (NP (DT the) (NN flagella) (NN structure))) (SBAR (WHNP (WDT that)) (S (VP (VBZ enables) (ADVP (RB motility))))))) (. .)))