BIOLOGICAL AND ANTIGENIC SPECIFICITY 329 



diazotized and nitroso compounds can also be prepared from 

 them. This is largely because the diazo ( — N=N — ) compounds 

 link readily to the nucleus, provided it possesses an OH or an 

 NHg group to favor linkage. This will also be made more clear 

 in the next chapter. A few of the aromatic amino acids are 

 tyrosine, phenyl-alanine, tryptophane and liistidine. Their struc- 

 tural formulae and importance in antigens will be apparent from 

 a study of the chapter on modified antigens. 



Zozaya's Nonprotein Antigen. — Zozaya (1932) reports that a 

 colloidal solution of collodion particles which had been made to 

 absorb protein-free carbohydrate haptens of the pneumococcus 

 functioned as an antigen. This has been referred to in a previous 

 chapter. 



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