Provided below are ELISA kits targeting basic helix-loop-helix family member e40, a human protein encoded by BHLHE40. This protein is 412 amino acids long with a reported mass of 45.5 kDa. This is reported to be a cytoplasmic and nuclear protein. Other alias names for this protein include: basic helix-loop-helix domain containing class B 2, class B basic helix-loop-helix protein 2, differentially expressed in chondrocytes 1, differentiated embryo chondrocyte expressed gene 1, and enhancer-of-split and hairy-related protein 2.