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OCRL was screened for mutations by single-strand conformation analysis (SSCA) sequencing techniques as previously described (Satre et?al, 1999), after informed consent was obtained from all patients or their parents, in accordance with French law. A medical questionnaire to obtain information on previous haemorrhagic events, during surgery or trauma, or spontaneous was completed for each patient. Haemostasis was explored with clotting tests (prothrombin time (PT), activated partial thromboplastin time (aPTT), and fibrinogen level), on 0��129?mol/l citrated blood using the STA analyzer (Diagnostica Stago, Asni��res, France). We also explored http://www.selleckchem.com/products/epz-6438.html primary haemostasis with the platelet-function analyzer (PFA-100 system, Siemens, Marburg, Germany). Blood specimens were analysed within 1?h of sampling. Platelet-poor-plasma was stored at ?80��C until tested for von Willebrand factor (VWF) antigen (Liatest VWF: Ag, Diagnostica Stago) and VWF ristocetin cofactor activity performed by optical aggregometry (Regulest Aggregometer; AFFI-Bio, Nancy, France). EDTA-anticoagulated blood was used for haematocrit determination and blood cell counts on Sysmex XE-2100 (Sysmex Corporation, Kobe, Japan). Platelet functions were assessed with light transmission aggregometry in platelet-rich plasma (PRP) (Regulest Aggregometer; AFFI-Bio) as recommended for the diagnosis of bleeding disorders (Hayward et?al, 2009) and with flow cytometry on FACScan http://www.selleckchem.com/products/PD-0325901.html flow cytometer and CellQuest software (Becton Dickinson, San Jose, USA) using platelet Gp/receptors http://www.selleck.cn/products/JNJ-26481585.html kit (Biocytex, Marseille, France). ROCK, a RhoA-activated kinase, was inhibited with Y27632 (Sigma Aldrich, St Louis, MO, USA). Adenosine 5-diphosphate (ADP) closure times (CTs) were measured after a 60-s preincubation of citrated blood from seven control subjects (healthy blood donors from the Etablissement Fran?ais du Sang, enrolled with their written informed consent) with 200?��mol/l Y27632 or vehicle (0��9% NaCl). In the same way, platelet aggregation induced by thrombin-receptor-activating-peptide (TRAP) (Bachem, Budendorf, Switzerland) was studied after preincubation of PRP with Y27632 or vehicle. Patients�� mutations, demographics and clinical characteristics are given in Table?I. Their median [range] age was 7��5 [1�C17]?years. Four patients reported a bleeding history: Patients 1 and 4 suffered from haemorrhagic complications of cataract surgery during infancy. Patient 6 had experienced severe late bleeding after tooth extraction at 14?years. Patient 2 had 2 bleeding events, during cataract extraction, and during surgery for craniostenosis at 3?years. Although transfusion is not uncommon during craniostenosis surgery, the prolonged bleeding in Patient 2 was unusual. PT and aPTT were normal in all patients (13��06?��?0��67?s, normal value