I’m unable to see the reaction you’re referring to as I can't view images or diagrams. However, I can help you identify substrates, products, and enzymes in a general reaction context.
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Substrate: This is the molecule that the enzyme acts upon. It is typically the reactant(s) in the reaction.
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Product: This is the molecule(s) that are produced as a result of the enzymatic reaction. It is typically the end result.
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Enzyme: This is the biological catalyst that accelerates the reaction. It is usually a protein that binds to the substrate to facilitate the conversion to the product.
If you provide a specific reaction description, I could help you better identify these components!