( ( In ( ( the head ) ( of ( ( the sperm ) ( is ( its ( nucleus ( containing ( ( its chromosomes ) ( made ( of ( ( ( ( ( ( the ( genetic material ) ) , ) DNA ) , ) and ) ( a vesicle ) ) ) ) ) ) ) ) ) ) ) ) ) ( , ( ( ( ( ( the acrosome ) , ) ( filled ( with ( ( ( digestive enzymes ) , ) acrosin ) ) ) ) , ) ( ( needed ( penetrate ( ( the coverings ) ( of ( the egg ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN head)) (PP (IN of) (NP (NP (DT the) (NN sperm)) (SBAR (S (VP (VBZ is) (NP (PRP$ its) (NN nucleus) (S (VP (VBG containing) (NP (NP (PRP$ its) (NNS chromosomes)) (VP (VBN made) (PP (IN of) (NP (NP (DT the) (JJ genetic) (NN material)) (, ,) (NP (NNP DNA)) (, ,) (CC and) (NP (DT a) (NN vesicle)))))))))))))))) (, ,) (NP (NP (DT the) (NN acrosome)) (, ,) (VP (VBN filled) (PP (IN with) (NP (NP (JJ digestive) (NNS enzymes)) (, ,) (NP (NN acrosin))))) (, ,)) (VP (VBD needed) (VP (VB penetrate) (NP (NP (DT the) (NNS coverings)) (PP (IN of) (NP (DT the) (NN egg)))))) (. .)))
In the head of the sperm is its nucleus containing its chromosomes made of the genetic material, DNA , and a vesicle , the acrosome , filled with digestive enzymes, acrosin , needed penetrate the coverings of the egg.
(ROOT (S (NP (NP (DT The) (`` ``) (NN head) ('' '')) (PP (IN of) (NP (DT the) (NN sperm)))) (VP (VBZ contains) (NP (DT the) (JJ genetic) (NN material))) (. .)))