Abstract
Summary
1. Potent and standardized liver preparations were injected into normal pregnant rats before, during and after the anlage of the mesoderm in the developing embryo. 2. Differential counts were made on wet and dry smears of blood from 15-day fetuses and the percent of non-nucleated red cells present taken as an index of maturation of the blood picture. 3. In a series of 264 treated and untreated fetuses from 66 litters of rats, statistical analysis of the data indicates the response in liver-treated animals to be within the range of biological variation.
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