Y. Colin et al., RECENT ADVANCES IN MOLECULAR AND GENETIC-ANALYSIS OF RH BLOOD-GROUP STRUCTURES, Journal of medical primatology, 22(1), 1993, pp. 36-43
The Rh antigens are carried by 30-32 kDa integral proteins of the red
cell membrane. The Rh locus is composed of two genes: RhD, which encod
es the major D antigen and is present only in Rh-positive genomes, and
RhCcEe, which encodes both the Cc and Ee polypeptides, most likely by
alternative splicing events. The D and non-D Rh mRNAs have been clone
d. Their sequence homology suggest that the two Rh genes have evolved
by duplication of a common ancestor.