( ( ( Each ( three ( consecutive letters ) ) ) ( of DNA ) ) ( ( ( code ( for ( ( one letter ) ( of protein ) ) ) ) ( according ( to ( the ( genetic code ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Each) (CD three) (JJ consecutive) (NNS letters)) (PP (IN of) (NP (NNP DNA)))) (VP (VBD code) (PP (IN for) (NP (NP (CD one) (NN letter)) (PP (IN of) (NP (NN protein))))) (PP (VBG according) (PP (TO to) (NP (DT the) (JJ genetic) (NN code))))) (. .)))
Each three consecutive letters of DNA code for one letter of protein according to the 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)))))) (. .)))