( ( ( Mouse ( A9 cells ) ) ( that ( contain ( ( a ( single ( human chromosome ) ) ) ( tagged ( with ( ( a ( dominant ( selectable ( marker gene ) ) ) ) ( such ( as neo ) ) ) ) ) ) ) ) ) ( ( were constructed ) . ) )
(ROOT (S (NP (NP (NNP Mouse) (NNP A9) (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (NP (DT a) (JJ single) (JJ human) (NN chromosome)) (VP (VBN tagged) (PP (IN with) (NP (NP (DT a) (JJ dominant) (JJ selectable) (NN marker) (NN gene)) (PP (JJ such) (IN as) (NP (NN neo))))))))))) (VP (VBD were) (VP (VBN constructed))) (. .)))
Mouse A9 cells that contain a single human chromosome tagged with a dominant selectable marker gene such as neo were constructed.
(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.