( Lymphocytes ( ( are ( produced ( within ( ( bone marrow ) ( -LRB- ( ( a ( primary ( lymphoid organ ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Lymphocytes)) (VP (VBP are) (VP (VBN produced) (PP (IN within) (NP (NP (NN bone) (NN marrow)) (PRN (-LRB- -LRB-) (NP (DT a) (JJ primary) (NN lymphoid) (NN organ)) (-RRB- -RRB-)))))) (. .)))
Lymphocytes are produced within bone marrow (a primary lymphoid organ).
(ROOT (S (NP (NNP Bone) (NNP marrow)) (VP (VP (VBZ is) (VP (VBN found) (PP (IN inside) (NP (JJ many) (NNS bones))))) (CC and) (VP (VBZ produces) (NP (NNS lymphocytes)))) (. .)))