There are a number of ELISA Kits available for the measurement of small nuclear ribonucleoprotein 40 (U5), another term for the human protein, small nuclear ribonucleoprotein U5 subunit 40. Other synonyms may include: U5 small nuclear ribonucleoprotein 40 kDa protein, 38 kDa-splicing factor, Prp8-binding protein, U5 snRNP 40 kDa protein, U5-40K, U5-40kD protein, and WD repeat domain 57 (U5 snRNP specific). It is encoded by the SNRNP40 gene to yield a protein 357 amino acids in length and 39.3 kDa in size. However, there are up to 2 reported isoforms. Versions of small nuclear ribonucleoprotein 40 (U5) are present in other organisms, including: Mouse, Rat, Zebrafish, Frog.