Autocorrelation analysis, as described in refs. 10 , 15 , for PSD95 ( d ; n = 90 synapses from four brain slices from two mice). Autocorrelation analysis examines the protein distribution. A uniform distribution would be predicted if baseline g a ( r ) values are observed at all radii, whereas a nonuniform distribution with regions of high local intensity would be predicted if high g a ( r ) values are observed at short radii and decay as the radius is increased.