Abstract
Animal and vegetal halves of 16-cell stages of Paracentrotus lividus were reared at 23 and 13 °C. Cleavage and differentiation were not hampered within this temperature range. At 13 °C the animal halves became animalized and the vegetal halves vegetalized as compared with the halves reared at 23 °C. This indicates the existence of animal and vegetal metabolic systems with different temperature coefficients. It also suggests an unchanged an/veg balance in whole embryos at different temperatures, since the systems are affected in opposite ways.
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