( ( ( The proteins ) ( involved ( in ( the ( Pho pathway ) ) ) ) ) ( ( include ( ( ( ( ( ( ( ( ( a cyclin ) ( -LRB- ( Pho80 -RRB- ) ) ) , ) ( CDK ( -LRB- ( Pho85 -RRB- ) ) ) ) , ) and ) ( ( CDK inhibitor ) ( -LRB- ( Pho81 -RRB- ) ) ) ) , ) ( proteins ( belonging ( to ( ( a family ) ( previously ( thought ( to ( be ( ( used exclusively ) ( to ( regulate ( the ( eukaryotic ( cell cycle ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS proteins)) (VP (VBN involved) (PP (IN in) (NP (DT the) (NNP Pho) (NN pathway))))) (VP (VBP include) (NP (NP (NP (NP (DT a) (NN cyclin)) (PRN (-LRB- -LRB-) (NP (NNP Pho80)) (-RRB- -RRB-))) (, ,) (NP (NP (NNP CDK)) (PRN (-LRB- -LRB-) (NP (NNP Pho85)) (-RRB- -RRB-))) (, ,) (CC and) (NP (NP (NNP CDK) (NNP inhibitor)) (PRN (-LRB- -LRB-) (NP (NNP Pho81)) (-RRB- -RRB-)))) (, ,) (NP (NP (NNS proteins)) (VP (VBG belonging) (PP (TO to) (NP (NP (DT a) (NN family)) (VP (ADVP (RB previously)) (VBN thought) (S (VP (TO to) (VP (VB be) (VP (VBN used) (ADVP (RB exclusively)) (S (VP (TO to) (VP (VB regulate) (NP (DT the) (JJ eukaryotic) (NN cell) (NN cycle)))))))))))))))) (. .)))
The proteins involved in the Pho pathway include a cyclin (Pho80), CDK (Pho85), and CDK inhibitor (Pho81), proteins belonging to a family previously thought to be used exclusively to regulate the eukaryotic cell cycle.
(ROOT (S (NP (NNS Cyclins)) (VP (VB regulate) (NP (DT the) (NN cell) (NN cycle)) (ADVP (RB only)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP are) (ADJP (RB tightly) (VBN bound) (PP (TO to) (NP (NNS cdks)))))))) (. .)))