Essential for embryogenesis. Required for normal deposition of neutral lipids in the oocyte. Cytoplasm and on surface of neutral lipid storage droplets in oocytes. Colocalizes with Lsd-1 to the droplet surface in cells of fat bodies. Ubiquitous expression in early embryos. At stage 5 expression is restricted to the pole cells. At stage 11 expression is seen in the amnioserosa, refined to the fat body and midgut by stage 14. Also seen in the hindgut by the end of embryogenesis. Expression is seen in larval fat body (at protein level). Expressed both maternally and zygotically. Expressed throughout development with highest zygotic expression in third instar larva and pupae. Belongs to the perilipin family.