Illustrations for two covers created for The Journal of General Physiology (jgp.rupress.org/), showing a variety of membrane proteins (left) and couplon structures in striated muscle (right); the latter figure is from an article titled "The couplonopathies: A comparative approach to a class of diseases of skeletal and cardiac muscle" [J. Gen. Physiol. 145, 459 (2015). doi: 10.1085/jgp.201411321].