A serum containing antibody activity within the MN blood group system
is described. Absorption studies showed that the serum detects two new antigenic
determinants that have been named Tm and Sj. The results obtained when 1,400
bloods, 500 from Negroes and 900 from Caucasians, were tested for ten antigens in
the MN system - M, M(1), N, S, s, U, Hu, He, Tm and Sj - are presented. Unlike
most of the recently described new antigens in the MN system both Tm and Sj
are of fairly high frequency in Caucasians and Negroes. Calculations of gene frequencies
from these data are published in an accompanying paper [7].
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