The cover is a cartoon representation of the structure of the yeast c10 ring (20 transmembrane helices (TMH), pdb, 3U2F) along with hypothetical positions of the 5 TMH of subunit a and 2 TMH of subunit b. Image by Ting Xu and David Mueller (Rosalind Franklin University of Medicine and Science, USA); modified by MIC. The cover is published under the Creative Commons Attribution (CC BY) license.