Anti-HSPC126 antibodies enable researchers to detect and measure the HSPC126 antigen in biological samples. This target is a reported synonym of the MED4 gene, which encodes mediator complex subunit 4. This protein is known to function in transcription by RNA polymerase II, among other biological roles. The human version of HSPC126 has a canonical amino acid length of 270 residues and a protein mass of 29.7 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus of cells and widely expressed in many tissue types. Other names for this target antigen include ARC36 and DRIP36.