Task: Answer Verification
Input (English): Question: Is early activation of matrix metalloproteinase-9 associated with blood-brain barrier disruption after photothrombotic cerebral ischemia in rats?
Answer: The early activation of MMP-9 was correlated with the increase in the permeability of the BBB. Our findings suggest that MMP-9 is the key factor involved in BBB disruption and subsequent brain injury after photothrombotic cerebral ischemia in rats.
Output (English): yes