Genet. Res., Camb. (1987), 50, pp. 17–21Heterogeneity of human haptoglobin α chains detected by two-dimensional gel electrophoresisThe running title for this article should have been Human plasma haptoglobin α chain heterogeneityGenet. Res., Camb. (1987), 50, pp. 63–68Additive variance and average effect with partial selfing(1) The second line of Table 1 should read