( ( ( The process ) ( of mitosis ) ) ( ( ( is traditionally ) ( divided ( into ( ( ( four ( main phases ) ) , ) ( which ( are ( arbitrary ( divisions ( of ( a ( continuous process ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN process)) (PP (IN of) (NP (NNS mitosis)))) (VP (VBZ is) (ADVP (RB traditionally)) (VP (VBN divided) (PP (IN into) (NP (NP (CD four) (JJ main) (NNS phases)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (ADJP (JJ arbitrary) (NP (NP (NNS divisions)) (PP (IN of) (NP (DT a) (JJ continuous) (NN process)))))))))))) (. .)))
The process of mitosis is traditionally divided into four main phases, which are arbitrary divisions of a continuous process.
(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.