There are a number of ELISA Kits available for the measurement of NAPI-3B, another term for the human protein, solute carrier family 34 member 2. Other synonyms may include: sodium-dependent phosphate transport protein 2B, sodium/phosphate cotransporter 2B, solute carrier family 34 (sodium phosphate) member 2, solute carrier family 34 (type II sodium/phosphate cotransporter) member 2, NAPI-3B, NAPI-IIb, and NPTIIb. It is encoded by the SLC34A2 gene to yield a protein 690 amino acids in length and 75.8 kDa in size. However, there are up to 2 reported isoforms. The protein is categorized into the SLC34A transporter family. Versions of NAPI-3B are present in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.