Figure 1From: Aging is associated with increased activities of matrix metalloproteinase-2 and -9 in tenocytes Results of the MTT assay of tenocytes from rats from three age groups 24Â h and 48Â h after plating revealed that the OD value of old tenocytes was significantly lower than that of young tenocytes (Middle: middle aged; * p < 0.001, ** p < 0.001, n > 4). Back to article page