(Top left to bottom right) First author Oscar Arenas and co-authors Tomás Osorno, Gerardo Malagón, Camilia Pulido, María del Pilar Gomez, and Enrico Nasi demonstrated that pScop2 is a bona-fide photopigment; knocking it down eliminates the current shift that accompanies photoisomerization (graph, bottom trace). Headshots courtesy of the authors.