Anti-Kruppel like factor 4 antibodies are directed against the protein encoded by the gene KLF4 in humans. The gene may also be known as Kruppel-like Factor 4, EZF, GKLF, Krueppel-like factor 4, and Kruppel-like factor 4 (gut). Structurally, the protein is reported to be 54.7 kilodaltons in mass. Based on gene name, canine, porcine, monkey, mouse and rat orthologs may also be found.