(A) MTT assay on primary rat hepatocytes, primary rat HSCs, mixed cultures of rat hepatocytes and NPCs, human microvascular endothelial cells, and HSC-T6 cells treated with gliotoxin for 4 hours. (B) Thymidine incorporation assay on primary rat hepatocytes treated with a low dose of gliotoxin for 4 consecutive days in culture. (C) TUNEL staining on primary rat hepatocytes, HSCs, and mixed cultures (hepatocytes and NPCs) treated with gliotoxin for 4 hours.