| Enzyme Abbreviation | Common Phenotypes | Remarks |
|---|---|---|
| Adenosine deaminase (ADA) | 1, 2, 2-1 | Rare variants exist (3-1, 4-1, 5-1, 6-1, 7-1) |
| Adenylate kinase (AK) | 1, 2, 2-1 | Rare variants exist (3-1, 4-1, 5-1) |
| Carbonic anhydrase (CA II) | 1, 2, 2-1 | Takes 4 to 6 years to reach adult levels |
| Erythrocyte acid phosphatase (EAP, ACP) | A, B, BA, C, CA, CB | Stability of bands C > B > A |
| Esterase D (ESD) | 1, 2, 2-1, 1-5, 2-5, 5 | Five allelic products observable with IEF |
| Glucose-6-phosphate dehydrogenase (G6PD) | A, B, AB | Mainly polymorphic in blacks; AB normally |
| Glyoxalase (GLO I) | 1, 2, 2-1 | In sperm and plasma |
| Peptidase A (PEP A) | 1, 2, 2-1 | In plasma more than sperm |
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