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A1 and A2 milk are different, but you wouldn’t know it by looking. A2 milk usually carries specific A2 branding, and milk without it is treated as regular milk. In the lab, though, A2 milk can’t be told apart by taste, colour, smell, appearance, or any routine quality or compositional test. The two beta-casein (CSN2) variants differ by a single amino acid at position 67. A1 has histidine there, and A2 has proline, and standard dairy quality control parameters usually can’t pi