Ready-to-use ELISA kits are available for the detection of S100 calcium-binding protein A4, an alias of the protein, S100 calcium binding protein A4. The official gene symbol is S100A4. The protein has a mass of 11.7 kDa and length of 101 residues. It is a member of the S-100 family and may be known by other names, including: metastasin 1, malignant transformation suppression 1, fibroblast-specific protein-1, calcium placental protein, and protein S100-A4, and placental calcium-binding protein.