Fig. 4
Collagenase and elastase inhibition activities of major compounds identified in Marula stem ethanol extract at 20, 10 and 5 μg/ml. (Error bars represent SEM, with n = 3). 
 = P < 0.05, 
 = P < 0.01 represent a significant difference with EDTA at 5 μg/ml, 
 = P < 0.05, 
 = P < 0.01 represent a significant difference with EDTA at 10 μg/ml, 
 = P < 0.05, 
 = P < 0.01 represent a significant difference with EDTA at 20 μg/ml, and 
 = P < 0.05, 
 = P < 0.01 represents a significant difference with elafin