Addendum to: Nature Immunology https://doi.org/10.1038/ni852, published online 4 November 2002.

Concerning the original publication, the authors acknowledge and apologize for possible inadvertent errors that may have occurred during the assembly of PCR measurements for β-actin expression in Langerhans cells and monocytes, as well as CCL2/7 expression in UV-irradiated skin. Unfortunately, the original data were generated over 22 years ago and are no longer available. However, Langerhans cells and monocytes express β-actin and the reproducibility of UV-induced CCL2 and CCL7 expression is validated through immunohistochemistry (Fig. 6b in original article) and corroborated by multiple independent studies in mice and human.