IFNK (Interferon kappa): IFNK is a cytokine belonging to the interferon family that plays a key role in regulating immune responses, particularly in skin and mucosal immunity. It helps modulate inflammation and antiviral defences by interacting with specific receptors on target cells. IFNK is primarily expressed in epithelial tissues, where it supports defence against viruses, bacteria, and other pathogens. It also contributes to tissue homeostasis and the regulation of epithelial cell growth and differentiation. Dysregulation of IFNK signalling has been linked to various immune-related conditions.