Subunit composition of plasma von Willebrand factor: Cleavage is present in normal individuals, increased in IIA and IIB von Willebrand disease, but minimal in variants with aberrant structure of individual oligomers (type IIC, IID, and IIE) - Zimmerman, TS; Dent, JA; Ruggeri, ZM; Nannini, LH (J Clin Invest, 1986)