The gene that makes the tails of fireflies glow has been added to mustard plants. The most familiar group are the fireflies, beetles of the family Lampyridae. After she leaves, Hisako notices two small, glowing fireflies under the tin. Most fireflies are distasteful to many vertebrate predators. While at the shelter, Seita entertains Setsuko by catching and releasing fireflies inside. Enzymes are also involved in more exotic functions, such as luciferase generating light in fireflies. Tropical fireflies, in particular, in Southeast Asia, routinely synchronise their flashes among large groups. Multiple recent studies investigate deeply the effects of artificial night lighting on fireflies. "You would not believe your eyes, if ten million fireflies". Another safe source of illumination in mines was bottles containing fireflies. However, Ellie survives the infection and seeks help from Marlene, the leader of the Fireflies. Elmo gets out with the help of fireflies. At her insistence, Joel swears his story about the Fireflies is true. He has also appeared in "Water Rats" and "Fireflies". MaNan, written by the stars and celebrated by the fireflies, finally are happy.