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CA1 pyramidal neuron (red) filled during whole-cell recording in a ventral hippocampal slice of a female MeCP2-GFP heterozygous mice, where nonmutant neurons express GFP-tagged MeCP2 (green) and mutant neurons lack MeCP2-GFP (W. Li, H. Egido-Betancourt, H. Robinson, L. Pozzo-Miller, unpubl.). See Robinson and Pozzo-Miller (LearnMem 26: 343–350).