Anti-DEFA1 antibodies are used in the immunodetection of the protein defensin alpha 1. It is notably expressed in the bone marrow and spleen. Synonyms for this target antigen include DEFA2, HNP-1, HP-1, HP1, MRS, neutrophil defensin 1, defensin, alpha 1, myeloid-related sequence, and DEF1. A number of DEFA1 antibodies have been mentioned in research publications and have associated citations. Immunohistochemistry is a widely used application for these antibodies. ELISA and Western Blot are also common applications.