My research project aims to investigate the effects of bilirubin on the maturation and function of fibroblasts, I was going to differentiate mesenchymal stem cells into fibroblasts to then investigate. However, I have now found current studies to describe the two as indistinguishable, this is including their morphology, gene expression patterns, surface markers, proliferation, differentiation, and immunomodulatory capacities. Any advice is much appreciated.