CatSper3, is a

protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, res ...

which in humans is encoded by the ''CATSPER3''

gene In biology, the word gene (from , ; "... Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b ...

. CatSper3 is a member of the cation channels of sperm family of proteins. The four proteins in this family together form a Ca²⁺-permeant ion channel specific essential for the correct function of sperm cells.*

References

Ion channels {{membrane-protein-stub