Ready-to-use ELISA kits are available for the detection of delta-like 4 (Drosophila), an alias of the protein, delta like canonical Notch ligand 4. The official gene symbol is DLL4. The protein, with a mass of 74.6 kDa and length of 685 residues, is reported to be membrane-associated. It may be known by other names, including: notch ligand DLL4, drosophila Delta homolog 4, delta-like 4 homolog, delta ligand 4, delta 4, and delta-like protein 4, and AOS6.