Anti-fem 1 homolog b antibodies enable researchers to detect and measure the fem 1 homolog b antigen in biological samples. This target is a reported synonym of the FEM1B gene, which encodes fem-1 homolog B. This protein is known to function in the apoptotic pathway and protein ubiquitination, among other biological roles. The human version of fem 1 homolog b has a canonical amino acid length of 627 residues and a protein mass of 70.3 kilodaltons. It is reported to be localized in the nucleus and cytoplasm of cells and widely expressed in many tissue types. fem 1 homolog b is a member of the Fem-1 protein family.