MMP9 and Stroke: Relative mRNA expression of ARG1, MMP, and s100a12 was significantly increased in whole blood of stroke patients within 24 h of symptom onset compared to control (relative ARG1 expression = 3.4 ± 3.2, p = 0.004; relative MMP9 expression = 3.2 ± 2.8, p = 0.004; relative s100a12 expression = 2.2 ± 1.5, p = 0.006).