What happens if antibodies attach to antigens on the red blood cells?

According to https://courses.lumenlearning.com/suny-ap2/chapter/blood-typing/

" When anti-A antibodies (added to the first well) contact A antigens on AB erythrocytes, they will cause agglutination. Similarly, when anti-B antibodies contact B antigens on AB erythrocytes, they will cause agglutination."

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