Abstract
.alpha.1-Antitrypsin phenotypes were determined in 1395 male Saskatchewan grain buyers. These included 1254 type M, 80 MS, 35 MZ and 26 which were untyped or other rare phenotypes. Siblings and offspring of the MS men had a significantly greater number of deaths (P < 0.01). Offspring of MZ men also had an increased number of deaths. These appeared to occur in all age groups except in those 2-17 yr of age. This finding raises questions about the role of both the S and Z alleles.