The Antigen Duclos

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Abstract
An antibody is described which defines a new high frequency red cell antigen, Duclos, whose expression seems to require the presence of U and Rh fundamental antigens. Apart from the antibody maker''s own red cells the only nonreactive samples were from Rhnull U impaired individuals, one example of which yielded very slight amounts of antibody through absorption-elution tests. Rhmod U weak cells gave very depressed reactions and Rhnull U positive or Rh common U negative cells gave moderately depressed reactions. The proposita''s red cells had an apparently normal Rh-LW condition, but their U antigen was significantly decreased. No further Duclos negative individual was found by screening 8500 blood donors in the Paris [France] area.