( ( ( ( ( ( Classic ( gene expression ) ) ( usually ( follows ( ( ( the ( central dogma ) ) , ) ( that ( ( is , ) ( DNA ( serves ( as ( ( the template ) ( for ( ( ( its duplication ) and ) ( RNA synthesis ) ) ) ) ) ) ) ) ) ) ) ) ) , ) and ) ( again ( , ( RNA ( serves ( as ( ( the template ) ( for ( protein synthesis ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Classic) (NN gene) (NN expression)) (ADVP (RB usually)) (VP (VBZ follows) (NP (NP (DT the) (JJ central) (NN dogma)) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (, ,) (SBAR (S (NP (NNP DNA)) (VP (VBZ serves) (PP (IN as) (NP (NP (DT the) (NN template)) (PP (IN for) (NP (NP (PRP$ its) (NN duplication)) (CC and) (NP (NNP RNA) (NNP synthesis))))))))))))))) (, ,) (CC and) (S (ADVP (RB again)) (, ,) (NP (NNP RNA)) (VP (VBZ serves) (PP (IN as) (NP (NP (DT the) (NN template)) (PP (IN for) (NP (NN protein) (NN synthesis))))))) (. .)))
Classic gene expression usually follows the central dogma, that is, DNA serves as the template for its duplication and RNA synthesis, and again, RNA serves as the template for protein synthesis.
(ROOT (S (NP (NNP Gene) (NN expression) (CC and) (NN protein) (NNS synthesis)) (VP (VBP are) (ADVP (RB usually)) (VP (VBN considered) (NP (DT the) (JJ same) (JJ molecular) (NN process)))) (. .)))