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Gel column results showing feline erythrocyte antigen (FEA) 4 (A), 6 (B) and 7 (C) blood typing against the same 6 cats (number 241‐246). +: positive = presence of the FEA on the surface of the index cat's red blood cells; −: negative = absence of the FEA on the surface of the index cat's red blood cells. All autocontrols were negative
