( NP ( ( ( is ( one ( of ( ( a class ) ( of ( small ( organic chemicals ) ) ) ) ) ) ) ( that ( , ( ( when ( combined ( with ( a protein ) ) ) ) ( , ( will ( stimulate ( ( the generation ) ( of ( ( an antibody ) ( against itself ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP NP)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT a) (NN class)) (PP (IN of) (NP (JJ small) (JJ organic) (NNS chemicals)))))) (SBAR (IN that) (S (, ,) (SBAR (WHADVP (WRB when)) (S (VP (VBN combined) (PP (IN with) (NP (DT a) (NN protein)))))) (, ,) (VP (MD will) (VP (VB stimulate) (NP (NP (DT the) (NN generation)) (PP (IN of) (NP (NP (DT an) (NN antibody)) (PP (IN against) (NP (PRP itself))))))))))) (. .)))
NP is one of a class of small organic chemicals that, when combined with a protein, will stimulate the generation of an antibody against itself.
(ROOT (S (NP (NNS Antibodies)) (VP (VBP recognize) (CC and) (VBP combine) (PP (IN with) (NP (JJ harmful) (NNS materials))) (, ,) (PP (VBG including) (NP (NP (DT both) (JJ toxic) (NNS chemicals)) (CC and) (NP (JJ invasive) (NNS microorganisms))))) (. .)))