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Knowledge of the atomic-level structures of materials is extremely important for correlating the properties and functions of material in any scientific discipline, including chemistry, biology, and physics. However, the determination of the structures of the magic-sized nanoclusters, which typically serve as nuclei of the semiconductor nanocrystals, remains highly challenging largely due to instability and inhomogeneity. In a recent finding, the researchers identified that the tertiary diamine and halide ligands can overcome these hurdles together, and revealed the core-cage structure in a subnanometer-sized 27-atom semiconductor cadmium selenide nanocluster, Cd14Se13.