Purity ~95% (SDS-PAGE). The mucosa-associated epithelial chemokine CCL28 is a common mucosal chemokine which is constitutively expressed by epithelial cells in most mucosal sites. Both CCL28 and CCL25 have recently been shown to be essential for lymphocyte migration to gastrointestinal tissues. CCL28 attracts IgA ASC, but not IgG or IgM ASC, from both intestinal and extraintestinal mucosal tissue, while CCL25 preferentially attracts IgA ASC from the small intestine and its draining lymphoid tissues, as well as alpha-4-beta-7(+) T cells. Source: Recombinant protein corresponding to mouse CCL28 expressed in E. coli. Molecular Weight: ~12kD Biological Activity: Determined by the ability to chemoattract human lymphocytes using a concentration range of 2-10ng/mL. Endotoxin: <1EU/ug (LAL)