( Antibodies ( ( ( ( are ( very specific ) ) and ) ( will ( ( match ( the antigen ) ) ( on ( ( ( only ( one ( specific germ ) ) ) , ) ( similar ( to ( ( ( a lock ) and ) key ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Antibodies)) (VP (VP (VBP are) (ADJP (RB very) (JJ specific))) (CC and) (VP (MD will) (VP (VB match) (NP (DT the) (NN antigen)) (PP (IN on) (NP (NP (RB only) (CD one) (JJ specific) (NN germ)) (, ,) (ADJP (JJ similar) (PP (TO to) (NP (NP (DT a) (NN lock)) (CC and) (NP (NN key)))))))))) (. .)))
Antibodies are very specific and will match the antigen on only one specific germ, similar to a lock and key.
(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)))))) (. .)))