RBFOX3 and placental insufficiency: However, as reductions in the number of hippocampal cells have been described in other IUGR animal models (Mallard et al., 2000), we performed an in depth analysis of the impact of CMO‐induced utero‐placental insufficiency on the number of neurons immunolabeled with NeuN in the pyramidal layer of the CA1 subfield of the hippocampus (n = 3 from each experimental group).