FREE AMINO ACIDS IN BLOOD. I 361 

Figs. 21-28. Chromatograms prepared from samples removed from an 7m vitvo incubation study 
of erythrocytes in plasma (see text). 0.25 ml of plasma and red cells used. Figs. 21-24 from 
plasma and Figs. 25-28 from erythrocytes removed at zero time, and after 30, 120, and 240 min 
of incubation. The uppermost arrows point to threonine (left) and serine (iight) that separated 
widely on this particular batch of filter paper. The lower row of arrows point to (from left to right) 
glutamine, glutamic acid, and aspartic acid. Note the increase of the acidic amino acids in both 
plasma and cells during the incubation. For abbreviations see p. 369. 
References p. 447/448 
