“Naturally occurring” anti‐Kell(Kl) is reported for the first time and was found in the sera obtained from two male adults. The two examples of this antibody were detected as a result of routine screening of donors' blood for atypical antibodies. Both strongly agglutinated type K:l cells in saline solution at room temperature. The mechanism of formation of the anti‐Kl was not known in either case.
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Morgan et al. (1963) studied this question.
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