15798
Elastase perfusion to induce AAA formation in A ( 2A ) R - knockout ( A ( 2A ) RKO ) and C57BL6 / J wild - type ( WT ) mice resulted in nearly 100 % larger aneurysms in A ( 2A ) RKO compared to WT at d 14 ( P < 0 . 05 ) , with evidence of greater elastin fragmentation , more immune cell infiltration , and increased matrix metallatoproteinase ( MMP ) 9 expression ( P < 0 . 05 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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