Protective effects of collagen polypeptide from tilapia skin against injuries to the liver and kidneys of mice induced by d-galactose oleh Dong-Dong Li, Wen-Jie Li, Song-Zhi Kong, Si-Dong Li, Jia-Qi Guo, Min-Hui Guo, Ting-Ting Cai, Ning Li, Ri-Zhi Chen, Rong-Qiong Luo, Wei-Xiang Tan