CFAP21 is an alias for the gene, EF-hand domain family member B, in humans. Other names include: EF-hand domain-containing family member B; cilia and flagella associated protein 21; EF-hand domain family, member B. The encoded protein has an amino acid length of 833 and a mass of 93.8 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.