88 F. SORM [5 



methods, ion exchange on Dowex 50, and paper chromatography. Table 9 

 shows the composition or structure of the individual basic peptides isolated. 

 The close resemblance between the structures found in the two proteins is 

 quite evident. Although the isolation of both the arginine and the histidine 

 peptides was carried out with particular care in this instance, the number 

 of individual peptides eventually isolated is small when compared with the 

 total number of residues of the two basic amino acids known to be present 

 in the haemoglobins. Moreover, no evidence was found for the presence of 

 histidine or arginine in the neutral or acid peptide fractions. Our results 



Table 9 



PEPTIDES OF ARGININE, HISTIDINE, AND 

 LYSINE ISOLATED FROM PARTIAL HYDRO- 

 LYSATES OF HORSE AND HOG HAEMO- 

 GLOBIN 



