The Y'Lira crèche was a group of Seleneans who were designed from birth to be scientists. The Y'Lira crèche were bred for curiosity, analysis and flexibility of thought. Selenean Ensign Y'lira Modan of the starship USS Titan was of the Y'Lira crèche (TTN novel: Sword of Damocles) Y'Lira Medoxa from DS9: "Chiaroscuro" was likely to be of the Y'Lira crèche as well.