Old fibroblasts secrete inflammatory cytokines that drive variability in reprogramming efficacy between individuals and could affect wound healing Nature Mahmoudi, S., Mancini, E., Moore, A., Jahanbani, F., Hebstreit, K., Srinavasan, R., Li, X., Devarajan, K., Prelo, L., Ang, C., Shibuya, Y., Benayoun, B. A., Chang, A. S., Wernig, M., Wysocka, J., Longaker, M. T., Snyder, M., Brunet, A. 2019; Accepted