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Isozymes

Enzymes with different amino acid sequences that catalyze the same reaction.

Also: Isoenzymes

Tissue- or compartment-specific enzyme variants (e.g., LDH isozymes, hexokinases I-IV) that allow tailored regulation of a common reaction.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Tissue- or compartment-specific enzyme variants (e.g., LDH isozymes, hexokinases I-IV) that allow tailored regulation of a common reaction.

Isoforms