Biological activity of recombinant factor VIII variants lacking the central B-domain and the heavy-chain sequence Lys713-Arg740: discordant in vitro and in vivo activity. - Mertens, K; Donath, MJ; van Leen, RW; de Keyzer-Nellen, MJ; Verbeet, MP; Klaasse-Bos, JM; Leyte, A; van Mourik, JA (Br J Haematol, 1993)