Predicted to enable lipid binding activity. Predicted to be involved in innate immune response in mucosa and negative regulation of toll-like receptor 4 signaling pathway. Predicted to act upstream of or within innate immune response. Predicted to be located in extracellular region. Is expressed in alimentary system; male reproductive gland or organ; primitive streak; respiratory system; and thymus. Orthologous to human BPIFB1 (BPI fold containing family B member 1). [provided by Alliance of Genome Resources, Apr 2022]