Colocalization Benchmark Source
The Colocalization Benchmark Source (CBS) is a free collection of downloadable images for testing and validating the degree of colocalization of markers in any fluorescence microscopy study. Colocalization is a visual phenomenon in which two molecules of interest are associated with the same structures in the cells and may share common functional characteristics.
Source: Wikipedia — Colocalization Benchmark Source (CC BY-SA 4.0)