The file photo taken on June 17, 1999 shows the 11th Panchen Lama, Bainqen Erdini Qoigyijabu, presenting an eternal knot to his brother at his residence in Lhasa, southwest China's Tibet Autonomous Region. Celebrations were held in Xigaze, southwest China's Tibet Autonomous Region, on Tuesday to mark the 20th anniversary of the enthronement of Bainqen Erdini Qoigyijabu, the 11th Panchen Lama, one of the two most revered "living Buddhas" in Tibetan Buddhism. (Xinhua/Li Xueren)