F13B and ischemic stroke: We found evidence of a significantly high level of shared genetic risk for FXIIIB–all ischemic stroke (rGSNP=−0.71, SE=0.81, P=0.01, N=10,668; h2SNP FXIIIB =0.13, SE=0.28; h2SNP ischemic stroke =0.45, SE=0.04).