( therefore ( , ( ( one antigen ) ( ( may ( stimulate ( synthesis ( of ( many ( different antibodies ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB therefore)) (, ,) (NP (CD one) (NN antigen)) (VP (MD may) (VP (VB stimulate) (NP (NP (NN synthesis)) (PP (IN of) (NP (JJ many) (JJ different) (NNS antibodies)))))) (. .)))
therefore, one antigen may stimulate synthesis of many different antibodies.
(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)))))) (. .)))