( ( this damage ) ( ( is ( mediated ( by ( leukocytes ( -LRB- ( ( ( a type ) ( of ( white ( blood cell ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT this) (NN damage)) (VP (VBZ is) (VP (VBN mediated) (PP (IN by) (NP (NP (NNS leukocytes)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (JJ white) (NN blood) (NN cell)))) (-RRB- -RRB-)))))) (. .)))
this damage is mediated by leukocytes (a type of white blood cell).
(ROOT (S (NP (JJ Leukocytes) (NN blood) (NNS cells)) (VP (VBP are) (ADJP (JJ white))) (. .)))