78 



A. Neuberger 



standard deviations of the counts. We have also compared 

 the radioactivities of the glycine and valine at each point in 

 time, making allowance for the ^*C dose of each amino-acid 



Table II 



Radioactivities of Valine Samples from Rat Globin 



Vj, = terminal vahne 

 Vjjj=non- terminal valine 



Results are given in cts./min./cm.^ (infinite thickness) 



injected, viz. 5 juc./lOO g. body wt. of glycine and 3-5 /xc./lOO g. 

 body wt. of DL-valine. Fig. 5 shows that the ratio of molar 

 radioactivities of glycine and of valine, corrected for differences 



14 

 12 

 10 



GLYCINE 

 VALINE 



_i_ 



\Z 



24 



HOURS 



72 



I 2 



WETEKS 



Fig. 5. Comparison of molecular radioactivities of glycine and 

 valine obtained from rat haemoglobin at various times after 

 simultaneous administration of the two amino-acids. Results 

 have been corrected for differences in dosage as discussed in the 



text. 



