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Blood typing.
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So you have three test tubes.
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In tube one, we have anti -a antibodies.
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In tube two, we have anti -b antibodies.
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And in tube three, we have anti -a, we have rh antibodies.
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And we observe clumping in the first two tubes.
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Now, what that is doing is telling you that the a antibodies are attacking the a antigen.
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Clumping only happens when there's the matching antigen to attack.
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So this blood sample has the a antigen.
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Same thing with this test tube number two.
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The b antibody is attacking the b antigen.
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So this blood has the b antigen as well.
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Now, notice that there is no clumping in this test tube right here because the rh factor is absent.
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There is no rh antigen to attack.
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No antigen, no clumping because that's what the antibody attacks...