( ( Sperm cells ) ( ( ( ( ( are usually ) motile ) , ) ( having ( a ( single flagellum ) ) ) ) . ) )
(ROOT (S (NP (JJ Sperm) (NNS cells)) (VP (VBP are) (ADVP (RB usually)) (ADJP (JJ motile)) (, ,) (S (VP (VBG having) (NP (DT a) (JJ single) (NN flagellum))))) (. .)))
Sperm cells are usually motile, having a single flagellum .
(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))))))) (. .)))