von Willebrand factor. A reduced and alkylated 52/48 kDa fragment beginning at amino acid residue 449 contains the domain interacting with platelet glycoprotein lb - Fujimura, Y; Titani, K; Holland, L Z; Russell, S R; Roberts, J R; Elder, J H; Ruggeri, Z M; Zimmerman, T S (J. Biol. Chem., 1986)