The phenomena observed on absorption of immune sera to azoproteins with heterologous azoantigens lead to the conclusion that in general the sera do not contain a single antibody but antibody fractions somewhat different in their reactivity for heterologous antigens. From the constitution of the azocomponent it follows that these fractions cannot be specific for distinct chemical groups in the molecule. In fact, inhibition experiments showed that in the cases examined the various antibodies are all specifically directed towards the whole molecule of the homologous hapten.

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