BPI fold-containing family B member 4 (BPIFB4)

May have the capacity to recognize and bind certain classes of odorants. May act as a carrier molecule, transporting odorants throughout the mucus layer to get receptor websites.

May serve as a primary defense mechanism by recognizing and eliminating potentially harmful odorants or pathogenic microorganisms from the mucosa or clearing excess odorant from mucus to empower new odorant stimulation to be received (By similarity). .