Purity ~95% (SDS-PAGE). CCL25 is constitutively expressed in epithelium and mucosal vessels in the small bowel, where it interacts with gut-homing B and T cells expressing its receptor, CCR9. Source: Recombinant protein corresponding to human CCL25 expressed in E. coli. Molecular Weight: ~14kD Biological Activity: Determined by the ability to induce chemotaxis of purified human monocytes at concentrations ranging between 2-10ng/mL. Endotoxin: <1EU/ug (LAL)