Pomegranate fruit husk has two parts: an outer, hard pericarp, and an inner, spongy mesocarp (white "albedo"), which comprises the fruit inner wall where seeds (arils) attach. Membranes of the mesocarp are organized as nonsymmetric chambers that contain seeds inside sarcotestas, which are embedded without attachment to the mesocarp. Containing juice, the sarcotesta is formed as a thin membrane derived from the epidermal cells of the seeds.