Profile of secreted proteases. Conditioned medium were individually harvested from each human insulin-producing cell line. In quantitative zymography of MMP9, the gelatinolytic bands (inset) were visualized by negative staining and measured with an image analyzer. Each value represents the mean ± SD of triplicate determinations.
Labriola et al. BMC Cell Biology 2009 10:49 doi:10.1186/1471-2121-10-49