In studies of Thai blood donors, 243 of 2,500 subjects (9.7%) were Mi-a positive. All but two were of class Mi -II. Family studies established that Mi III is probably inherited as an autosomal dominant character and usually accompanies the Ms gene complex of the MNSs blood group system.

Abstract. A new antibody in Anek serum reacts with 7% of Thai Mi III donor samples.

Two examples of anti-Hut which is specific for cell class II of the Miltenberger complex were found by simple absorption test of previously called 'anti-Mi-a'.