Source: recombinant protein expressed in Sf21 cells · Mr: 54 kDa ? PPARs are members of the nuclear receptor family of ligand activated transcription factors that heterodimerize with retinoic acid like receptors, regulating gene expression and differentiation. PPARδ is a mediator of diverse physiological functions including lipid and cholesterol homeostasis, embryo implantation, and cancer development. Most recently, attention has been focused on the role of PPARδ in obesity.