Figure 4. Collagenase and gelatinase activities in response to impulsive shock. The asterisk denotes statistically significant change (p < 0.01), and the bar represents a standard error of mean. (A) Collagenase and gelatinase activities in NS101 (normal) and MH7A (RA) cells. (B) Ratio of MMP activities in MH7A cells to MMP activities in NS101 cells.