Flow cytometric analysis of PC-3 human prostate cancer cell line was stained with Sheep Anti-human Matriptase/ST14 Catalytic Domain Antigen Affinity-purified Polyclonal Antibody (Product # PA5-47554) or control antibodyopen histogram), followed by 557-conjugated Anti-Sheep IgG Secondary Antibody. To facilitate intracellular staining, cells were fixed with paraformaldehyde and permeabilized with saponin.