Anti-LLCFC1 antibodies are used in the immunodetection of the protein LLLL and CFNLAS motif containing 1. In humans, the canonical protein has a reported length of 122 amino acid residues and a mass of 13.5 kDa. It has been described to be a secreted protein. Up to 3 different isoforms have been reported for this protein. LLCFC1 is known to be a sperm protein required for fusion of sperm with the egg membrane during fertilization. Synonyms for this target antigen include LLLL and CFNLAS motif-containing protein 1, MSSP-binding protein CTM-1, sperm-oocyte fusion required protein 1, uncharacterized protein C7orf34, and sperm-egg fusion protein LLCFC1. LLCFC1 gene orthologs have been reported in the mouse, rat, bovine and chimpanzee species. Immunofluorescence is the most common application for the LLCFC1 antibodies listed below. ELISA, Immunocytochemistry, and Immunohistochemistry are also common applications.