SCHMIDT 



important role in all this type of stress mechanism, if it goes 

 more than three or four days. 



NORTHEY: Does it depend upon the antigenicity of the material? 

 This would depend on how antigenetic the material is, in which 

 case it would be independent of the protein metabolism. 



CAMPBELL: I don't know what you mean by antigenicity. 

 Some of the things like hemocyanin seem to stimulate more 

 precipitating antibodies than, say, serum albumin. Now, what 

 the basis of this is, I don't know. Some people say that anti- 

 genicity is related to molecular weight because all albumin 

 is a very good antigen. But more important is seeing how a 

 material is localized and handled by intracellular enzymes. 



418 



