( ( ( The presence ) ( of antigens ) ) ( ( ( stimulates ( the ( lymphocyte cells ) ) ) ( into ( producing ( polyclonal antibodies ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN presence)) (PP (IN of) (NP (NNS antigens)))) (VP (VBZ stimulates) (NP (DT the) (JJ lymphocyte) (NNS cells)) (PP (IN into) (S (VP (VBG producing) (NP (JJ polyclonal) (NNS antibodies)))))) (. .)))
The presence of antigens stimulates the lymphocyte cells into producing polyclonal antibodies .
(ROOT (S (NP (DT An) (NN animal)) (VP (VBZ produces) (NP (JJ polyclonal) (NNS antibodies)) (PP (IN after) (NP (NP (NN exposure)) (PP (TO to) (NP (DT a) (JJ microbial) (NN antigen)))))) (. .)))