Extrinsic Allergic Alveolitis, also known as hypersensitivity pneumonitis, is related to bird fancier's lung and tropical spastic paraparesis, and has symptoms including hemoptysis An important gene associated with Extrinsic Allergic Alveolitis is MUC5B (Mucin 5B, Oligomeric Mucus/Gel-Forming), and among its related pathways/superpathways are Innate Immune System and ERK Signaling. The drugs Ethanol and Chlorhexidine have been mentioned in the context of this disorder. Affiliated tissues include lung and skeletal muscle, and related phenotypes are homeostasis/metabolism and immune system