( ( ( The ( building block ) ) ( of ( cells ( and ( animal tissues ) ) ) ) ) . )
(ROOT (NP (NP (DT The) (VBG building) (NN block)) (PP (IN of) (NP (NNS cells) (CC and) (NN animal) (NNS tissues))) (. .)))
The building block of cells and animal tissues.
(ROOT (S (NP (NNS Cells)) (VP (VBP are) (NP (NP (DT the) (VBN specialized) (NN building) (NNS blocks)) (PP (IN of) (NP (PRP$ your) (NN body))))) (. .)))