PFN1 and neoplasm: Four spots were found to be upregulated by p19 overexpressed and microsequencing revealed them to be (1) TCTP (translationally controlled tumor protein, see the spot in Figure 4A; (2) the kinase nm23-H1 (metastasis inhibition factor nm23); (3) Profilin 1 (inhibitor of the polymerization of actin), and (4) PSMB6 (proteasome subunit).