( However ( , ( ( ( ( ( ( if ( ( too ( many antibodies ) ) ( are ( present ( that ( can ( bind ( to ( the antigen ) ) ) ) ) ) ) ) ) ( , ( then ( ( the ( antigenic sites ) ) ( are ( coated ( by antibodies ) ) ) ) ) ) ) , ) and ) ( ( ( ( ( few or ) no ) antibodies ) ( directed ( toward ( the pathogen ) ) ) ) ( are ( able ( to ( bind ( ( more ( than one ) ) ( antigenic particle ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (S (SBAR (IN if) (S (NP (RB too) (JJ many) (NNS antibodies)) (VP (VBP are) (ADJP (JJ present) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB bind) (PP (TO to) (NP (DT the) (NN antigen))))))))))) (, ,) (ADVP (RB then)) (NP (DT the) (JJ antigenic) (NNS sites)) (VP (VBP are) (VP (VBN coated) (PP (IN by) (NP (NNS antibodies)))))) (, ,) (CC and) (S (NP (NP (ADJP (JJ few) (CC or) (DT no)) (NNS antibodies)) (VP (VBN directed) (PP (IN toward) (NP (DT the) (NN pathogen))))) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB bind) (NP (QP (JJR more) (IN than) (CD one)) (JJ antigenic) (NN particle)))))))) (. .)))
However, if too many antibodies are present that can bind to the antigen, then the antigenic sites are coated by antibodies, and few or no antibodies directed toward the pathogen are able to bind more than one antigenic particle.
(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)))))) (. .)))