( ( The ( Human ( Genome Project ) ) ) ( ( involved ( sequencing ( ( the ( ( three billion ) ( DNA letters ) ) ) ( of ( the ( complete ( human ( genetic code ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Human) (NNP Genome) (NNP Project)) (VP (VBD involved) (S (VP (VBG sequencing) (NP (NP (DT the) (QP (CD three) (CD billion)) (NNP DNA) (NNS letters)) (PP (IN of) (NP (DT the) (JJ complete) (JJ human) (JJ genetic) (NN code))))))) (. .)))
The Human Genome Project involved sequencing the three billion DNA letters of the complete human genetic code.
(ROOT (S (NP (DT The) (JJ genetic) (NN code)) (VP (VBZ works) (PP (IN in) (NP (NP (NN series)) (PP (IN of) (NP (JJ three-letter) (NNS codes)))))) (. .)))