Recombinant proteins for S100 calcium binding protein Z are available from various sources. In humans, this protein has a Uniprot ID of Q8WXG8. This protein is 99 amino acids in length and 11.7 kilodaltons in mass. This protein is encoded by the gene S100Z. Other names also exist, such as: protein S100-Z, S100 calcium binding protein, zeta. This protein is conserved in other species, including: mouse, rat.