G. R. TRISTRAM 



Table I 



Amino acid composition of haemoglobin and myoglobin 



1 Wt of amino acid in 100 gm protein. 



2 Number of residues per molecule. 



2a Number of residues in myoglobin assuming M. W. to be 68,000 

 (i.e. 4 x 17,000). 



Those reported in Table I for cystine and methionine were obtained 

 by R. Kuhn et aP using an iodometric procedure. The cysteine value 

 was obtained 10 by titration of the intact protein. There are other 

 values for these acids, e.g. methionine 1-5 per cent (Lyman et al 11 by 

 means of microbial assay) and 0-95 per cent (Rees, in unpublished ex- 

 periments using differential oxidation) and cystine-cysteine 0-72 per cent 



110 



