Serum glucose level was analyzed using glucose oxidase method (Applygen, Beijing, China) (Wang C. et al., 2016 (link)). Serum insulin level was determined by ELISA using an ultra-sensitive mouse insulin kit (Crystal Chem, USA) (Ding et al., 2016 (link)). Serum levels of total cholesterol, triglycerides, LDL-C, HDL-C, and free fatty acids (FFA) levels were assayed using the calorimetric kits from Nanjing Jiancheng Bioengineering Institute (Nanjing, China) (Jiang et al., 2016 (link); Wang et al., 2019 (link); Liu et al., 2020 (link)). Liver TG was analyzed using Tissue triglyceride assay kit (Applygen, Beijing, China) (Wang C. et al., 2016 (link)).
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