[11C]AFM PET imaging results in rats: representative TACs for the brain (a), and cervical (b) and lumbar (c) sections of the spinal cord from the baseline and citalopram blocking scans in a healthy rat, and baseline scan in an SCI rat; (d) SUVmean for the cervical and lumbar sections of the spinal cord from the baseline and citalopram blocking scans in a healthy rat, summed from 30 to 60 min post-injection (mean ± SD, n = 4); (e) The lumbar-to-cervical activity ratio from the baseline and citalopram blocking scans in healthy rats, and baseline scans in SCI rats (mean ± SD, n = 13).