( ( Each antibody ) ( ( is ( specialised ( to ( recognise ( ( only ( one type ) ) ( of antigen ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Each) (NN antibody)) (VP (VBZ is) (VP (VBN specialised) (S (VP (TO to) (VP (VB recognise) (NP (NP (RB only) (CD one) (NN type)) (PP (IN of) (NP (NN antigen))))))))) (. .)))
Each antibody is specialised to recognise only one type of antigen.
(ROOT (S (NP (DT An) (NN antibody)) (VP (MD can) (VP (VB match) (NP (NP (CD one) (NNS types)) (PP (IN of) (NP (NNS antigens)))))) (. .)))