( ( ( ( Cell Types ) , ) ( Asexual ( and ( Sexual Reproduction ) ) ) ) ; )
(ROOT (NP (NP (NNP Cell) (NNP Types)) (, ,) (NP (NNP Asexual) (CC and) (NNP Sexual) (NNP Reproduction)) (: ;)))
Cell Types, Asexual and Sexual Reproduction;
(ROOT (S (NP (JJ Sexual) (NN reproduction)) (ADVP (RB usually)) (VP (VBP occur) (PP (IN during) (NP (NP (NNS times)) (PP (IN of) (NP (JJ environmental) (NN stress)))))) (. .)))