Frequency of occurrence of the Gm(21) factor in the Polish population.

In a sample of the Polish population of 610 subjects, frequency of the Gm(21) factor was determined and compared with the frequency of Gm(1). The Gm(21) factor was found with a frequency of 0.359, and Gm(1) with 0.370. Both factors were present in 35.7% of sera examined. Factor Gm(1) alone, unaccompanied by Gm(21), was encountered in 8 sera, and factor Gm(21) without Gm(1) only in one serum.