Anti-GCN1 eIF2 alpha kinase activator homolog antibodies are protein reagents that detect specific antigens. The GCN1 eIF2 alpha kinase activator homolog antigen is another term for the human protein GCN1 activator of EIF2AK4, encoded by the GCN1 gene. The protein is known to act as a positive activator of the EIF2AK4/GCN2 protein kinase activity in response to amino acid starvation. Canonically, it has an amino acid length of 2671 residues and a mass of 292.7 kilodaltons. Its subcellular localization is in the cytoplasm and it is ubiquitously expressed across many tissue types. The GCN1 eIF2 alpha kinase activator homolog protein is a member of the GCN1 protein family.