Knops blood group system

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The Knops blood group system was established in 1991. It was named after Mrs. Knops, the first antibody producer. It consists of eight antigens: Kna, Knb, McCa, SI1, Yka, McCb, SI2, and SI3. Most of the anigens of this system are common, occurring with a prevalence of >90% in most populations.[1]


  1. ^ Wintrobe's Clinical Hematology, Volume 1 (John P. Greer ed.).