( ( ( ( Cells ( have ( windows ( of ( various sizes ) ) ) ) ) and ) ( some ( ( have none ) ( at all ) ) ) ) . )
(ROOT (S (S (NP (NNS Cells)) (VP (VBP have) (NP (NP (NNS windows)) (PP (IN of) (NP (JJ various) (NNS sizes)))))) (CC and) (S (NP (DT some)) (VP (VBP have) (NP (NN none)) (PP (IN at) (NP (DT all))))) (. .)))
Cells have windows of various sizes and some have none at all.
(ROOT (S (NP (DT All) (NNS cells)) (VP (VBP have) (NP (NP (DT the) (JJ small) (NN size)) (PP (IN in) (NP (JJ common))))) (. .)))