Keratin 21
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Keratin 21 is a
type I cytokeratin Type I keratins (or Type I cytokeratins) are cytokeratins that constitute the Type I intermediate filaments (IFs) of the intracytoplasmatic cytoskeleton, which is present in all mammalian epithelial cells. Most of the type I keratins consist of acid ...
which expresses immunologically specific
fusion protein Fusion proteins or chimeric (kī-ˈmir-ik) proteins (literally, made of parts from different sources) are proteins created through the joining of two or more genes that originally coded for separate proteins. Translation of this ''fusion gene'' r ...
. It is not found in humans, but only in '' Rattus norvegicus''. It is first detectable after 18-19 days of gestation.


References

Keratins Mammalian proteins {{Protein-stub