Plant non-specific lipid-transfer proteins transfer phospholipids as well as galactolipids across membranes. May play a role in wax or cutin deposition in the cell walls of expanding epidermal cells and certain secretory tissues (By similarity). Stable at pH 3. Stable up to 90 degrees Celsius. Monomer. Disulfide bonds. Causes an allergic reaction in human. Binds to IgE. Found in celeriac but not in celery. Highly resistant to pepsin and other proteinases. Belongs to the plant LTP family.