( ( Its cells ) ( ( ( ( are motile ) and ) ( ( possess ( one ( subterminal ( sheathed flagellum ) ) ) ) ( at ( each end ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Its) (NNS cells)) (VP (VP (VBP are) (ADJP (JJ motile))) (CC and) (VP (VBP possess) (NP (CD one) (JJ subterminal) (NN sheathed) (NN flagellum)) (PP (IN at) (NP (DT each) (NN end))))) (. .)))
Its cells are motile and possess one subterminal sheathed flagellum at each end.
(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))))))) (. .)))