CONFLICT OF INTEREST STATEMENT The authors declare no competing interests. Supporting Information Filename Description cm21805-sup-0001-FigureS1.tifTIFF image, 5.3 MB FIGURE S1. Nuclear F-actin patterns in control mast cells. (a) F-actin and DNA were labeled with Phalloidin Alexa 555 and Hoescht 3342. Left, panels show representative images and the fluorescence intensity profiles for actin (orange) and DNA (blue) for the three F-actin pattern identified: weak, flatten, and empty. Scale bar: 10 μm.