TKT and lymphoma: Regulatory authorized EpiSkinTM-SM skin model (for skin irritation/corrosion); SkinEthicTM-HCE model (for eye irritation); BALB 3T3 NRU phototoxicity assay (for phototoxicity test); and mouse lymphoma assay (for TK gene mutation test) are among the series of chosen in vitro models that were conducted as per GLP standards.