Identification of an antigen shared by mouse liver and lung

In response to multiple injections of liver extract from Balb/c mice, DBA/1 mice produce antibodies against a component of the liver preparation which is not F-antigen, but which is able to precipitate in gel diffusion tests. This antigen is also found in extracts of Balb/c lung, but not in a variety of other organs tested. Liver extracts from all of the inbred strains studied contain the antigen, except extracts from DBA/1 mice. Furthermore, this antigen was not found in the liver or lungs of other vertebrates tested. The antigen has been designated antigen-L1.