A homozygote for the Rh complex .D. associated with the rare Evans antigen was identified and her family tested: .D./.D. can be clearly distinguished serologically from -D-/-D-. The immune antibody in the serum of the propositus reacts with all cells tested except homozygous -D-, CwD-, cD- and Rhnull cells.
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Contreras et al. (1979) studied this question.
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