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Expression profile of collagenases MMP-1, MMP-8 and MMP-13. Pie charts representing the amount of cases with an increase of RNA level for MMP-1 (a), MMP-1 (b) and MMP-13 (c) compared to the housekeeping gene. A 50-fold increase was termed minor, up to 500-fold moderate, up to 5,000-fold strong and more than 5,000-fold very strong
