On recent observations in the rhesus blood group system. I. A weak expression of the Rh antigen e. II. Finding of the rare Rh antigen Cx.

Upon testing blood samples for medico-legal purpose, an exceptionally weak expression of the Rhesus antigen e was observed. There is evidence for the phenotype Rh2rh which is rather unusual in white people. Apart from this, the low incidence antigen Cx has been found in two cases. Its mode of reaction with anti-C and anti-c sera is described.