Hippocampal neuron taken from newborn rat, transfected with Orai1 (red) and GFP (green), grown for 2 weeks in culture, imaged at high resolution in a confocal microscope, to detect changes in dendritic spines (small appendages, about 1um in diameter, stained with Orai1 (yellow=green+red). (For further details, see 330)