The picture shows cells in human psoriatic skin lesions of psoriasis patients before IL-4 therapy. The signaling molecule IL-23 was stained with a red dye, the cell nuclei with a green one.
Picture: E. Guenova, Y. Skabytska, W. Hoetzenecker, G. Weindl, K. Sauer, M. Tham, K.-W. Kim, J.-H. Park, J. H. Seo, D. Ignatova, A. Cozzio, M. P. Levesque, T. Volz, M. Köberle, S. Kaesler, P. Thomas, R. Mailhammer, K. Ghoreschi, K. Schäkel, B. Amarov, M. Eichner, M. Schaller, R. A. Clark, M. Röcken, und T. Biedermann, IL-4 abrogates TH17 cell-mediated inflammation by selective silencing of IL-23 in antigen-presenting cells, PNAS, Feb 2015, 112(7), 2163–2168, doi: 10.1073/pnas.1416922112.