( However ( , ( ( if ( we ( ( add just ) ( one ( additional ( antibody specificity ) ) ) ) ) ) ( , ( then ( we ( ( ( can theoretically ) ( build ( ( an ( endless chain ) ) ( consisting ( of ( ( many ( , ( many ( antibody ( and ( antigen molecules ) ) ) ) ) ) ( non-covalently ( linked ( to ( one another ) ) ) ) ) ) ) ) ) ) . ) ) ) ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (SBAR (IN if) (S (NP (PRP we)) (VP (VBP add) (ADVP (RB just)) (NP (CD one) (JJ additional) (NN antibody) (NN specificity))))) (, ,) (ADVP (RB then)) (NP (PRP we)) (VP (MD can) (ADVP (RB theoretically)) (VP (VB build) (NP (NP (DT an) (JJ endless) (NN chain)) (VP (VBG consisting) (PP (IN of) (NP (NP (JJ many) (, ,) (JJ many) (NN antibody) (CC and) (NN antigen) (NNS molecules)) (VP (ADVP (RB non-covalently)) (VBN linked) (PP (TO to) (NP (CD one) (DT another)))))))))) (. .)))
However, if we add just one additional antibody specificity , then we can theoretically build an endless chain consisting of many, many antibody and antigen molecules non-covalently linked to one another.
(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)))))) (. .)))