( ( The ( Thymus gland ) ) ( ( matures ( ( the ( CD4 cells ) ) ( produced ( in ( the ( bone marrow ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Thymus) (NN gland)) (VP (VBZ matures) (NP (NP (DT the) (CD CD4) (NNS cells)) (VP (VBN produced) (PP (IN in) (NP (DT the) (NN bone) (NN marrow)))))) (. .)))
The Thymus gland matures the CD4 cells produced in the bone marrow.
(ROOT (S (NP (DT The) (NNS thymus) (NN gland)) (VP (VBZ produces) (NP (NN t) (NNS cells))) (. .)))