NPTX2 and fetal growth restriction: Decreased neuronal pentraxin 2 (NPTX2 or Narp) suggests decreased excitatory input onto parvalbumin (PV)+ interneurons [25, 26], which along with impaired perineural net (PNN) formation and myelination suggest disrupted progression and closure of the pCP in IUGR offspring up to P40 (human equivalent to adolescence) [18, 19, 27–31].