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The rate-limiting step and the regulatory step are related concepts in metabolic pathways, but they are not the same. The rate-limiting step is the slowest reaction in a pathway, which determines the overall rate of the process. In contrast, a regulatory step refers to any step in a pathway that can be modulated by various factors, such as enzymes, allosteric regulators, or feedback mechanisms. While the rate-limiting step is often a regulatory step, not all regulatory steps are rate-limiting.

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