( ( Genes ( -LRB- ( ( ( single units ) ( of ( genetic information ) ) ) -RRB- ) ) ) ( ( are ( composed ( of ( ( hundreds ( of thousands ) ) ( of ( these ( DNA chains ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Genes)) (PRN (-LRB- -LRB-) (NP (NP (JJ single) (NNS units)) (PP (IN of) (NP (JJ genetic) (NN information)))) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (QP (NNS hundreds) (IN of) (NNS thousands))) (PP (IN of) (NP (DT these) (NN DNA) (NNS chains))))))) (. .)))
Genes (single units of genetic information) are composed of hundreds of thousands of these DNA chains.
(ROOT (S (NP (NNS Genes)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NN dna))))) (. .)))
Genes are composed of dna.