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Flow diagram documenting case enrollment and the 3 steps of the study (1. AB blood typing, 2. Detection of naturally occurring alloantibodies, and 3. Prospective blood typing for novel antigens). NOAb: naturally occurring alloantibodies; FEA: feline erythrocyte antigens; dotted arrow: When NOAb were detected in a cat during the detection of NOAb step, its plasma was tested during the blood typing step against the red blood cells of all other cats included thereafter in the study
