( ( ( ( ( The cell ) , ) ( of course ) ) , ) ( ( is ( ( ( ( the ( basic ( building block ) ) ) ( of ( ( life , ) ( billions ( of ( which ( ( make up ) ( ( the ( living tissues ) ) ( of ( our bodies ) ) ) ) ) ) ) ) ) ) -- ) ( including ( brain tissue ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN cell)) (, ,) (PP (IN of) (NP (NN course))) (, ,)) (VP (VBZ is) (NP (NP (DT the) (JJ basic) (NN building) (NN block)) (PP (IN of) (NP (NP (NN life)) (, ,) (NP (NP (NNS billions)) (PP (IN of) (SBAR (WHNP (WDT which)) (S (VP (VBP make) (PRT (RP up)) (NP (NP (DT the) (VBG living) (NNS tissues)) (PP (IN of) (NP (PRP$ our) (NNS bodies))))))))))) (: --) (PP (VBG including) (NP (NN brain) (NN tissue))))) (. .)))
The cell, of course, is the basic building block of life, billions of which make up the living tissues of our bodies -- including brain tissue.
(ROOT (S (NP (NNS Cells)) (VP (VBP are) (NP (NP (DT the) (JJ basic) (NN building) (NNS blocks)) (PP (IN of) (NP (DT the) (JJ human) (NN body))))) (. .)))