( GPI ( ( is ( encoded ( by ( ( a ( single gene ) ) ( in ( all ( body cells ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP GPI)) (VP (VBZ is) (VP (VBN encoded) (PP (IN by) (NP (NP (DT a) (JJ single) (NN gene)) (PP (IN in) (NP (DT all) (NN body) (NNS cells))))))) (. .)))
GPI is encoded by a single gene in all body cells.
(ROOT (S (NP (DT A) (JJ single) (JJ human) (NN body) (NN cell)) (ADVP (RB typically)) (VP (VBZ contains) (NP (NP (NNS thousands)) (PP (IN of) (NP (NNS genes))))) (. .)))
A single human body cell typically contains thousands of genes.