( Genes ( ( Our bodies ) ( ( are ( built ( of ( ( cells , ) ( ( ( about ( a hundred ) ) ( thousand billion ) ) ( of them ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Genes)) (NP (PRP$ Our) (NNS bodies)) (VP (VBP are) (VP (VBN built) (PP (IN of) (NP (NP (NNS cells)) (, ,) (NP (NP (QP (RB about) (DT a) (CD hundred)) (QP (CD thousand) (CD billion))) (PP (IN of) (NP (PRP them)))))))) (. .)))
Genes Our bodies are built of cells, about a hundred thousand billion of them.
(ROOT (S (NP (DT A) (JJ single) (JJ human) (NN body) (NN cell)) (ADVP (RB typically)) (VP (VBZ contains) (NP (NP (NNS thousands)) (PP (IN of) (NP (NNS genes))))) (. .)))
A single human body cell typically contains thousands of genes.