Anti-ALG-4 antibodies enable researchers to detect and measure the ALG-4 antigen in biological samples. This target is a reported synonym of the PDCD11 gene, which encodes programmed cell death 11. This protein is known to function in rRNA processing, among other biological roles. The human version of ALG-4 has a canonical amino acid length of 1871 residues and a protein mass of 208.7 kilodaltons. It is reported to be localized in the nucleus of cells and widely expressed in many tissue types.