Introduction
Keratin 18 (K18) is an intracellular protein expressed at high levels by many types of epithelial cells. During cell death, the cellular content of soluble K18 will be released into the extracellular compartment. The M65 EpiDeath® ELISA measures soluble keratin 18 (K18) (cytokeratin 18 [CK18]) released from dying cells and can be used in the research of overall cell death (due to apoptosis and necrosis) of epithelial cells.