( ( ( See ( Estrus ( , ( Oogenesis ( , ( Ovum ( , ( Sperm cell ) ) ) ) ) ) ) ) , ) Spermatogenesis )
(ROOT (NP (NP (NNP See) (NNP Estrus) (, ,) (NNP Oogenesis) (, ,) (NNP Ovum) (, ,) (NNP Sperm) (NNP cell)) (, ,) (NP (NNP Spermatogenesis))))
See Estrus , Oogenesis , Ovum , Sperm cell , Spermatogenesis
(ROOT (S (SBAR (IN While) (S (NP (NNS spermatogenesis)) (VP (VBZ produces) (NP (CD four) (JJ haploid) (NN sperm) (NNS cells))))) (, ,) (NP (NNS oogenesis)) (VP (VBZ produces) (NP (CD one) (JJ mature) (NN ovum))) (. .)))