MaR1 accelerated tissue regeneration in experimentally injured planaria worms. Planaria worms metabolize DHA to Mar1 during the healing phase of experimentally induced tissue injury. Sexual planaria are hermaphrodites, possessing both testicles and ovaries. Some species of planaria are exclusively asexual, whereas some can reproduce both sexually and asexually. Planaria are flat worms widely used in biological research. Planaria exhibit an extraordinary ability to regenerate lost body parts. Planaria can be cut into pieces, and each piece can regenerate into a complete organism. Other common species used are the blackish "Planaria maculata" and "Girardia dorotocephala". In contrast, two-headed planaria regenerates can be induced by exposing amputated fragments to electrical fields. For example, in Planaria neoblasts help in regeneration. Then its nutrients diffuse to the rest of the planaria. The vinyl LP version was released by Planaria Records. It was later released by Planaria Recordings in March 2005. It is currently represented by a single species, Planaria torva, which is found in Europe. Planaria receive oxygen and release carbon dioxide by diffusion.