There are a number of ELISA Kits available for the measurement of kinetochore-localized astrin/SPAG5 binding, another term for the human protein, kinetochore localized astrin (SPAG5) binding protein. Other synonyms may include: TRAF4 associated factor 1, kinastrin, kinetochore-localized astrin-binding protein, small kinetochore associated protein, and small kinetochore-associated protein kinetochore-localized astrin-binding protein TRAF4 associated factor 1. It is encoded by the KNSTRN gene to yield a protein 316 amino acids in length and 35.4 kDa in size. However, there are up to 3 reported isoforms. Versions of kinetochore-localized astrin/SPAG5 binding are present in other organisms, including: Mouse, Rat, Frog.