One cell, the “midget retinal ganglion cell,” carries the vast majority of visual information from the eye to the brain in humans. It has been thought to be a primate-specific innovation, making it impossible to study in accessible model systems. Josh Sanes shares how, using molecular comparison of retinas from 17 vertebrate species, researchers from his team and that of former postdoc Karthik Shekhar, were able to trace back through evolution and identify mouse orthologues of midget cells.

Yichun He and Hailing Shi share new work from labs of Jia Liu and Xiao Wang, on the creation of publicly accessible spatial atlas of the mouse brain with unprecedented level of detail—featuring an analysis of over one million individual cells that pinpointed approximately 230 unique molecular cell types and delineated 106 distinct molecular tissue regions.