( ( The ( Four Phases ) ) ( of Mitosis ) )
(ROOT (NP (NP (DT The) (CD Four) (NNS Phases)) (PP (IN of) (NP (NNP Mitosis)))))
The Four Phases of Mitosis
(ROOT (S (NP (NNS Mitosis)) (ADVP (RB actually)) (VP (VBZ occurs) (PP (IN in) (NP (CD four) (NNS phases)))) (. .)))
Mitosis actually occurs in four phases.