von Willebrand factor. A reduced and alkylated 52/48-kDa fragment beginning at amino acid residue 449 contains the domain interacting with platelet glycoprotein Ib - Fujimura, Y; Titani, K; Holland, LZ; Russell, SR; Roberts, JR; Elder, JH; Ruggeri, ZM; Zimmerman, TS (J Biol Chem, 1986)