( ( ( cyclins and ) ( cell ( cycle regulation ) ) ) ; )
(ROOT (NP (NP (NP (NNS cyclins)) (CC and) (NP (NN cell) (NN cycle) (NN regulation))) (: ;)))
cyclins and cell cycle regulation;
(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)))))))) (. .)))