300 E. ROBERTS AND D. G. SIMONSEN 
66 



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Figs. 65-68. Amino acid patterns in the liver (75 mg) of the tadpole and adult bullfrog (Rana 
catesberana). Fig. 65: 3.5 cm tadpole. Fig. 66: 4 cm tadpole. Fig. 67: 7 cm tadpole. 
Fig. 68: adult frog. 
Pigs. 69-72. Amino acid patterns of mouse liver (75 mg) at different stages of development. 
Figs. 69, ea 1r6th- and 18th-day nOSeS respectively. Figs. 71, 72: 19th-day fetus and adult 
mouse, respectively. Taurine, 5; /-alanine and/or glycerylphosphorylethanolamine, 12; 
glutamine, 3. 
than did the extracts of the adult heart, and hydroxyproline and asparagine were 
detected only in the younger tissues. Extracts of fetal and 1-day-old mouse heart 
contained relatively large amounts of glycine and serine. These amino acids were 
present in low concentrations in extracts of adult tissue. A relatively low level of 
References p. 348/349 
