( ( These results ) ( collectively ( ( suggest ( that ( ( ( only ( preexisting cells ) ) ( with ( promising pluripotency ) ) ) ( can ( be ( programmed ( into ( iPS cells ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT These) (NNS results)) (ADVP (RB collectively)) (VP (VBP suggest) (SBAR (IN that) (S (NP (NP (RB only) (VBG preexisting) (NNS cells)) (PP (IN with) (NP (JJ promising) (NN pluripotency)))) (VP (MD can) (VP (VB be) (VP (VBN programmed) (PP (IN into) (NP (NN iPS) (NNS cells))))))))) (. .)))
These results collectively suggest that only preexisting cells with promising pluripotency can be programmed into iPS cells.
(ROOT (S (NP (NNS Cells)) (VP (VBP come) (PP (IN from) (NP (VBG preexisting) (NNS cells)))) (. .)))