Dear Sylvie, the following paper may help you: Diaz Marin R, Crespo-Garcia S, Wilson AM, Sapieha P. RELi protocol: Optimization for protein extraction from white, brown and beige adipose tissues. MethodsX. 2019;6:918-28. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6500908/pdf/main.pdf