This chapter contains section titled: Introduction - Rh, not rhesus Haplotypes, genotypes, and phenotypes Biochemistry and molecular genetics D antigen (RH1) C, c, E, and e antigens (RH2, RH4, RH3, RH5) Other Rh antigens Rh-deficient phenotypes - Rhnull and Rhmod Putative function of the Rh proteins and RhAG