FGF21 and metabolic dysfunction-associated steatotic liver disease: In the search for the molecular processes underlying the association of plasma Fgf21 with NAFLD, the microarray data were analysed by a two-step approach: 1) gene co-expression network analysis using WGCNA18 and 2) functional pathways and up-stream regulator analysis were determined by applying Ingenuity pathway analysis (IPA) on the co-expression network.