Mean SA-647 versus GFP fluorescence for each GFP + neuron detected in biotin + saline-injected mice ( n = 218 neurons from 3 mice) or biotin + psilocybin-injected mice ( n = 220 neurons from 3 mice). The horizontal dashed line indicates the 90th percentile threshold value of all SA-647 neurons in the biotin + saline group.