Here he published, from 1919-1922, twelve papers on new haptens that he had discovered, on conjugates with proteins which were capable of inducing anaphylaxis and on related problems, and also on the serological specificity of the haemoglobins of different species of animals.    From Wordnik.com.  [Karl Landsteiner - Biography] Reference

He discovered new facts about the immunology of syphilis, added to the knowledge of the Wassermann reaction, and discovered the immunological factors which he named haptens (it then became clear that the active substances in the extracts of normal organs used in this reaction were, in fact, haptens).    From Wordnik.com.  [Karl Landsteiner - Biography] Reference

Painting of haptens onto UVR-exposed skin does not result in sensitization but induces regulatory T cells (Treg).    From Wordnik.com.  [Naturejobs - All Jobs] Reference

The first, irritant contact dermatitis (ICD) is a pathological non-specific inflammatory skin condition arising from the release of pro-inflammatory cytokines by keratinocytes in response to haptens, usually chemicals.    From Wordnik.com.  [Elites TV] Reference