Hepatitis D, also known as delta hepatitis, is related to hepatitis and hepatitis b, and has symptoms including fatigue, lethargy and anorexia. An important gene associated with Hepatitis D is GPT (Glutamic--Pyruvic Transaminase), and among its related pathways/superpathways are Cytokine Signaling in Immune system and Overview of interferons-mediated signaling pathway. The drugs Ribavirin and Peginterferon alfa-2b have been mentioned in the context of this disorder. Affiliated tissues include liver and t cells.