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- prepare blood types A, B, O, and AB
- drop each blood onto the appropriate reaction plate (two digits)
- drop anti-A serum on the left side of each reaction plate
- drop anti-B serum on the right side of each reaction plate
- mix the blood and serum with a toothpick (do not reuse the toothpick)
- look at the blood group agglutination reaction under the microscope
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