( ( stop ( bone ( tissue decay ) ) ) . )
(ROOT (S (VP (VB stop) (NP (NN bone) (NN tissue) (NN decay))) (. .)))
stop bone tissue decay.
(ROOT (S (NP (NNS Bones)) (VP (VBP are) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NNS tissues))))) (. .)))