The Matriptase/ST14 catalytic domain protein originates from epithelial cells, forms a complex with HAI-1, and is activated by sphingosine-1-phosphate. It cleaves and activates hepatocyte growth factor/scatter factor and urokinase plasminogen activator, suggesting its role as an activator of other proteases and potential growth factors. Matriptase/ST14 Catalytic Domain Protein, Human (His) is the recombinant human-derived Matriptase/ST14 Catalytic Domain protein, expressed by E. coli , with N-6*His labeled tag.