In the version of this Article originally published, technical problems led to errors in Figs. 2d and 5b. In the western blot panel in Fig. 2d, actin bands were misaligned at the bottom of the image and did not line up with the other bands in the panel; the corrected figure is shown below. In Fig. 5b, the upper right panel had an incorrect title of 'CXCL3/KC'; it should have instead been 'CXCL1/KC'. These errors have now been corrected in all versions of the Article.