Human endogenous retroviruses (HERVs) are repetitive elements, derived from ancient germline retroviral infections, that have increased in copy number by further rounds of infection, retrotransposition, and/or duplication. HHLA1 (HERV-H LTR-Associating 1) is a Protein Coding gene. Diseases associated with HHLA1 include Granular Cell Carcinoma and Testis Seminoma [From OMIM; GeneCards]