( ( Those cells ) ( ( ( send signals ) ( to ( the ( body ( to ( grow old ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Those) (NNS cells)) (VP (VBP send) (NP (NNS signals)) (PP (TO to) (NP (DT the) (NN body) (S (VP (TO to) (VP (VB grow) (ADJP (JJ old)))))))) (. .)))
Those cells send signals to the body to grow old.
(ROOT (S (NP (NNS Hormones)) (VP (VBP send) (NP (NNS signals)) (PP (IN through) (NP (PRP$ your) (NN body)))) (. .)))