Horsefly salivary gland immunosuppressant protein that likely inhibits the host inflammatory response by regulation of anti- and pro-inflammatory cytokines (PubMed:18087067). When tested on mouse splenocytes in the presence of LPS, it increases the secretion of the proinflammatory cytokine interleukin-10 (IL10) and decreases the secretion of the proinflammatory cytokine interferon-gamma (IFNG) in a dose-dependent manner (PubMed:18087067). Expressed in salivary glands.