( ( ( white ( blood cells ) ) ( -LRB- ( leukocytes -RRB- ) ) ) ( ( fight ( ( infections and ) illness ) ) . ) )
(ROOT (S (NP (NP (JJ white) (NN blood) (NNS cells)) (PRN (-LRB- -LRB-) (NP (NNS leukocytes)) (-RRB- -RRB-))) (VP (VBP fight) (NP (NNS infections) (CC and) (NN illness))) (. .)))
white blood cells ( leukocytes ) fight infections and illness.
(ROOT (S (NP (JJ Leukocytes) (NN blood) (NNS cells)) (VP (VBP are) (ADJP (JJ white))) (. .)))