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Fig. 1 A and A’, dorsal and ventral view, respectively, of brain of normal 
newbornrat. Body weight, 5.4 grams. Brain weight, 0.238 gram. X 3. 
B and B’, dorsal and ventral view, respectively, of brain of rat kept at birth 
weight by underfeeding for 20 days. Body weight, 5 grams. Brain weight, 
0.506 gram. X 3. 
(Continuation of explanation of figures on page opposite.) 
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