HTRA1 and stroke disorder: The median of relative expression levels of HTRA1 in the leukocytes of stroke cases was 1.24-fold lower than in the controls (HTRA1 relative expression, median and IQR of cases: 0.76 (0.49–1.34), median and IQR of controls: 0.94 (0.64–1.46), Fig. 2B), although the P value did not reach significance (P = 0.054) probably due to the limited sample size.