FREE AMINO ACIDS IN BLOOD. IV 409 

Fig. 184-191. From o.25 ml of plasma, erythrocytes and reticulocytes to illustrate effects of 
phenylhydrazine. Figs. 184-187, plasma samples from a control and 3 different phenylhydrazine 
treated animals. Note the marked elevation of most of the amino acids in plasma of the phenyl- 
hydrazine treated animals (Figs. 185-189). Fig. 188 shows the free amino acid pool of the erythro- 
cytes from the control blood sample, while Figs. t89-191 show the free amino acids of reticulo- 
cytes from the same blood samples. Note the marked increase in free amino acids of reticulocytes 
from the 3 phenylhydrazine treated animals. For abbreviations see p. 369. 
DISCUSSION 
The effects of nitrogen mustard on free amino acid levels in humans and rabbits are 
similar in most respects. Some humans are very sensitive to the drug and changes 
can be seen in blood free amino acids without observable effects on the hematopoietic 
References p. 447/448 
