( Sperm ( ( contain ( enzymes ( in ( ( the ( acrosome region ) ) ( of ( ( the head ) ( that ( allow ( them ( to ( penetrate ( these layers ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Sperm)) (VP (VBP contain) (NP (NP (NNS enzymes)) (PP (IN in) (NP (NP (DT the) (JJ acrosome) (NN region)) (PP (IN of) (NP (NP (DT the) (NN head)) (SBAR (WHNP (WDT that)) (S (VP (VBP allow) (S (NP (PRP them)) (VP (TO to) (VP (VB penetrate) (NP (DT these) (NNS layers)))))))))))))) (. .)))
Sperm contain enzymes in the acrosome region of the head that allow them to penetrate these layers.
(ROOT (S (NP (NP (DT The) (NN head)) (PP (IN of) (NP (DT the) (NN sperm)))) (VP (VBZ contains) (NP (DT the) (NN nucleus))) (. .)))
The head of the sperm contains the nucleus.