among most of the living organisms. These families are not similar in sequence or structure because they evolved independently of each other, but all evolved the same Zn²⁺ active site structure, showing a great example of convergent evolution.

Background

An enzyme is a substance that acts as a catalyst in living organisms which helps to speed up chemical reactions. Carbonic anhydrase is one important enzyme that is found in red blood cells, gastric mucosa, pancreatic cells, and even renal tubules. It was discovered

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