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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Shape of Proteins Just as a fork cannot be used to eat soup and a spoon cannot be used to spear meat, a protein's shape is essential to its function. A protein's shape is determined, most fundamentally, by the sequence of amino acids of which it is made (Figure 2.26a). The sequence is called the primary structure of the protein. Answer: amino
Output:
A protein's shape is determined, most fundamentally, by the sequence of what type of acids?