( ( A gene ) ( ( is ( ( a ( DNA sequence ) ) ( that ( encodes ( ( ( ( ( ( a protein ) , ) rRNA ) , ) or ) ( ( tRNA molecule ) ( -LRB- ( ( gene product ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN gene)) (VP (VBZ is) (NP (NP (DT a) (NN DNA) (NN sequence)) (SBAR (WHNP (WDT that)) (S (VP (VBZ encodes) (NP (NP (DT a) (NN protein)) (, ,) (NP (NN rRNA)) (, ,) (CC or) (NP (NP (NN tRNA) (NN molecule)) (PRN (-LRB- -LRB-) (NP (NN gene) (NN product)) (-RRB- -RRB-))))))))) (. .)))
A gene is a DNA sequence that encodes a protein, rRNA, or tRNA molecule (gene product).
(ROOT (S (NP (NNP Dna)) (VP (VBZ encodes) (NP (NP (NNS instructions)) (PP (IN for) (NP (NNS proteins) (NNS molecules))))) (. .)))