( ( Most ( of ( the DNA ) ) ) ( ( is ( in ( ( ( ( ( the nucleus ) ( of ( a cell ) ) ) , ) ( but not ) ) all ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT the) (NN DNA)))) (VP (VBZ is) (PP (IN in) (NP (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT a) (NN cell)))) (, ,) (CONJP (CC but) (RB not)) (NP (DT all))))) (. .)))
Most of the DNA is in the nucleus of a cell, but not all.
(ROOT (S (NP (NP (DT The) (NNS cells)) (PP (IN of) (NP (DT all) (NNS protists)))) (VP (VBP have) (NP (DT a) (NN nucleus))) (. .)))