Ready-to-use ELISA kits are available for the detection of Zolpidem, an alias of the protein, delta like non-canonical Notch ligand 1. The official gene symbol is DLK1. The kits can detect several species variants of the protein, including: human, mouse, and rat. The protein, with a mass of 41.3 kDa and length of 383 residues, is reported to be cytoplasmic and membrane-associated. It may be known by other names, including: DLK-1, DLK, preadipocyte factor 1, fetal antigen 1, delta-like 1 homolog, and protein delta homolog 1, and Pref-1.