SUMMARYLinkage studies on two families segregating for antithrombin III deficiency confirm the linkage betweenAT3and the Duffy blood group. The maximum lod score including two published families is +4.2 at recombination fractions around 0.1. Two patients with deletions of 1q have 1/2 levels of antithrombin III suggesting that theAT3locus lies in bands 1 q22 → 1q2
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