A phenotypically neutral dimorphism of protein S: the substitution of Lysl55 by Glu in the second EGF domain predicted by an A to G base exchange in the gene - Yamazaki, T; Sugiura, I; Matsushita, T; Kojima, T; Kagami, K; Takamatsu, J; Saito, H (Thromb Res, 1993)