injection of isologous 4 ( ethoxymethylene ) -2-phenyl-oxazolin-5-one ( oxazolone ; ox ) -substituted thymocytes or ox-labeled igg ( ox-igg ) into mice produces specific unresponsiveness in which immunization with homologous ( ox ) , but not heterologous ( picryl chloride ) , hapten on the skin does not result in significant contact sensitization .
C0031891
picryl chloride
C0018593
hapten