Abstract: Two cell lines, PICM-19H and PICM-19B, were derived from the bipotent ARS-PICM-19 pig liver stem cell line. The unipotent porcine stem cell line PICM-19H differentiates exclusively into hepatocytes and can be induced to express CYP450 enzymes. The growth rate and cell density in culture, morphological features, and hepatocyte detoxification functions, i.e., inducible CYP450 activity, ammonia clearance, and urea production of the PICM-19H cells were evaluated for their application in artificial liver devices. PICM-19H cells contain numerous mitochondria, Golgi apparatus, smooth and rough endoplasmic reticulum, vesicular bodies and occasional lipid vacuoles and display inducible CYP450 activity, clear ammonia, and produce urea in a glutamine-free medium. The data indicate that both cell lines, either together or alone, may be useful as the cellular substrate for an artificial liver device. The results demonstrate the potential for the use of PICM-19H cells in drug biotransformation and toxicity testing.