Recombinant proteins for S-phase response (cyclin related) are available from various sources. In humans, this protein has a Uniprot ID of Q15513. This protein is 63 amino acids in length and 7.6 kilodaltons in mass. This protein is encoded by the gene SPHAR. Other names also exist, such as: protein SPHAR, S-phase response protein. This protein is conserved in other species, including: mouse, rat.