Abstract
1. 1. The contents of ATP, ADP and AMP were determined by HPLC and adenylic energy charge (AEC) was estimated during different stages of the embryonic development of Bufo arenarum up to the tailbud stage. 2. 2. All the developmental stages studied showed a high ATP content (about 1.04–1.48 nmol/emb.). The concentration of ADP was low (0.025–0.041 nmol/emb.) but rose slightly at the neural tube stage. AMP was undetectable before the tailbud stage. 3. 3. AEC values were almost constant (about 0.987–0.992) throughout the period studied. Only a fall at the tailbud stage could be detected which can be related to this more advanced cellular differentiation stage.
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