( ( The ( cell cycle ) ) ( ( has ( ( four ( main phases ) ) ( -LRB- ( ( ( ( ( G1 , ) S ) , ) ( G2 ( , M ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN cell) (NN cycle)) (VP (VBZ has) (NP (NP (CD four) (JJ main) (NNS phases)) (PRN (-LRB- -LRB-) (NP (NNP G1)) (, ,) (NP (NNP S)) (, ,) (NP (NNP G2) (, ,) (NNP M)) (-RRB- -RRB-)))) (. .)))
The cell cycle has four main phases (G1,S,G2,M).
(ROOT (S (NP (NNS Cells)) (VP (VBP have) (NP (CD four) (NNS cycles))) (. .)))