Farmer's Lung, also known as farmer lung, is related to extrinsic allergic alveolitis and interstitial lung disease. An important gene associated with Farmer's Lung is CD4 (CD4 Molecule), and among its related pathways/superpathways are Innate Immune System and ERK Signaling. Affiliated tissues include lung and skin, and related phenotypes are homeostasis/metabolism and endocrine/exocrine gland