About the cover: Mis-localization of mutant DNAHS in respiratory epithelial cells from patients with primary ciliary dyskinesia carrying DNAHS mutations. Cover is based on images of confocal immunofluorescence analysis of human respiratory epithelial cells with anti-DNAH5 antibodies (red ) and with antibodies against axoneme-specific acetylated α-tubulin (green) as control. Nuclei were stained with Hoechst 33342 (blue). For more information see article by Hornef and colleagues, beginning on page 120.