The fact that the human body maintains a very small standing pool of ATP and relies on continuous regeneration is a basic physiological truism that does not require citation.
The claim states that the human body stores only a small amount of ATP at any given moment. This is a fundamental, textbook physiological fact (the body typically holds only around 50-100 grams of ATP at any time and recycles it constantly). Per Step 0 of the instructions, a statement that is trivially true by definition or direct everyday observation/established basic science is classified as COMMON_KNOWLEDGE, meaning no citation or literature weighing is needed, and indices/notes remain empty.