Ready-to-use ELISA kits are available for the detection of elrd, an alias of the protein, ELAV like RNA binding protein 4. The official gene symbol is ELAVL4. The protein has a mass of 41.8 kDa and length of 380 residues. It is a member of the RRM elav family and may be known by other names, including: PNEM, HUD, Hu antigen D, ELAV like neuron-specific RNA binding protein 4, ELAV (embryonic lethal abnormal vision Drosophila)-like 4 (Hu antigen D), and ELAV-like protein 4.