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