( T ( ( cells ( ( immune ( system cells ) ) ( that ( develop ( in ( the ( thymus gland ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP T)) (VP (VBZ cells) (NP (NP (JJ immune) (NN system) (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP develop) (PP (IN in) (NP (DT the) (JJ thymus) (NN gland)))))))) (. .)))
T cells immune system cells that develop in the thymus gland.
(ROOT (S (NP (DT The) (NNS thymus) (NN gland)) (VP (VBZ produces) (NP (NN t) (NNS cells))) (. .)))