Figure 1.

Gelatin zymogram demonstrating the gelatinolytic activity of two paired breast tumour and background tissue samples. Lane 1, molecular weight marker (MWM); lane 2, matrix metalloproteinase 2 (MMP-2) protein control; lanes 3–6, the tissue samples. The latent forms of MMP-2 and MMP-9 were found in both tumour and background breast tissues; however, the active forms of these enzymes were only found in the tumour tissue of these paired samples.