Many of the major pollen coat proteins are derived from endoproteolytic cleavage of oleosin-like proteins. Surface of oil bodies. Oleosins exist at a monolayer lipid/water interface (By similarity). The full-length protein is found in the tapetal lipid bodies of immature anthers, the proteolytically cleaved C-terminal product is found on the coats of pollen grains. Highest expression is in microspores entering and undergoing mitosis. No expression is observed in male-sterile plants, green tissues or roots. Expressed after tetrad release, until the end of the second pollen mitosis. Expressed in buds over 3 mm in length, maximum expression is observed in 3-4 mm buds and decreases rapidly in buds containing mature pollen. Belongs to the oleosin family.