TY - JOUR AU - Tsai, H M TI - Physiologic cleavage of von Willebrand factor by a plasma protease is dependent on its conformation and requires calcium ion JO - Blood IS - 10 VL - 87 PY - 1996 DO - 10.1182/blood.V87.10.4235.bloodjournal87104235 L3 - PubMed-ID: 8639782 SP - 4235 EP - 4244 ER -