Anti-Chdc1 antibodies enable researchers to detect and measure the Chdc1 antigen in biological samples. This target is a reported synonym of the LRCH1 gene, which encodes leucine rich repeats and calponin homology domain containing 1. This protein is known to act as a negative regulator of GTPase CDC42 by sequestering CDC42-guanine exchange factor DOCK8. The human version of Chdc1 has a canonical amino acid length of 728 residues and a protein mass of 80.9 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasm of cells and notably expressed in many tissues, such as the appendix, tonsil, and adrenal gland. This target antigen may also be known as NP81.