A monomeric von Willebrand factor fragment, Leu-504-Ser-728, inhibits von Willebrand factor interaction with glycoprotein Ib-IX - Gralnick, H R; Williams, S; McKeown, L; Kramer, W; Krutzsch, H; Gorecki, M; Pinet, A; Garfmkel, L I (Proc Natl Acad Sci USA, 1992)