For further information on the study, "Fucoidan Extract Induces Apoptosis in MCF-7 Cells via a Mechanism Involving the ROS-Dependent JNK Activation and Mitochondria-Mediated Pathways" by Zhongyuan Zhang (Graduate School of Bioresource and Bioenvironmental Sciences and Faculty of Agriculture, Kyushu University, Fukuoka, Japan), Kilchiro Teruya (Graduate School of Bioresource and Bioenvironmental Sciences and Faculty of Agriculture, Kyushu University, Fukuoka, Japan), Hiroshi Eto (Daiichi Sangyo Co., Ltd., Osaka, Japan) and Sanetaka Shirahata (Graduate School of Bioresource and Bioenvironmental Sciences and Faculty of Agriculture, Kyushu University, Fukuoka, Japan)