Ready-to-use ELISA kits are available for the detection of ESP3, an alias of the protein, TLE family member 3, transcriptional corepressor. The official gene symbol is TLE3. The protein, with a mass of 83.4 kDa and length of 772 residues, is reported to be nuclear. It is a member of the WD repeat Groucho/TLE family and may be known by other names, including: transducin-like enhancer of split 3 homolog of Drosophila E(sp1), transducin-like enhancer of split 3 short isoform, transducin like enhancer of split 3, enhancer of split groucho-like protein 3, enhancer of split groucho 3, and transducin-like enhancer protein 3, and GRG3.