PPM1K and hepatocellular carcinoma: A partial retrotranscript pseudogene psi protein phosphatase, Mg2+/Mn2+ dependent, 1K (ψPPM1K) containing inverted repeats can be processed into two endo-siRNAs that target and repress the expression of the cognate genes PPM1K and never in mitosis A-related kinase 8, leading to suppressed hepatocellular carcinoma cell proliferation (6).