( ( ( Gene Therapy ) ( ( Inserting ( normal ( human genes ) ) ) ( into ( ( genetically defective ) ( body cells ) ) ) ) ) . )
(ROOT (NP (NP (NNP Gene) (NNP Therapy)) (VP (VBG Inserting) (NP (JJ normal) (JJ human) (NNS genes)) (PP (IN into) (NP (ADJP (RB genetically) (JJ defective)) (NN body) (NNS cells)))) (. .)))
Gene Therapy Inserting normal human genes into genetically defective 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.