Function of the anal sacs and mid-gut in mitochondrial sulphide metabolism in the echiuran worm Urechis unicinctus. - Ma, Yu-Bin; Zhang, Zhi-Feng; Shao, Ming-Yu; Kang, Kyoung-Ho; Zhang, Li-Tao; Shi, Xiao-Li; Dong, Ying-Ping (Marine Biology Research, 2012)