Eight male WT (C57BL/6J) and eight male OPN-knockout mice (SPP1KO; B6.Cg-Spp1tm1Blh/J) were purchased by Charles River (Sulzfeld, Germany) and fed a high-fat diet (HFD, 60 kcal %, D12492; Research Diets, New Brunswick, NJ, USA) for 8 or 12 weeks. After the indicated time, mice were sacrificed and gonadal white adipose tissue (GWAT) was collected. The protocol was approved by the local ethics committee for animal studies.
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