FTA : Middle image is "b rGO-treated rats (1 h) showing differently-sized red dots that indicate the differential accumulation of nanoparticles, mainly in the dentate gyrus."
From an article titled The dentate gyrus: fundamental neuroanatomical organization (dentate gyrus for dummies):
The dentate gyrus is a simple cortical region that is an integral portion of the larger functional brain system called the hippocampal formation.
Making the Hippocampus great again.
https://jnanobiotechnology.biomedcentral.com/articles/10.1186/s12951-015-0143-z/figures/4
https://www.ncbi.nlm.nih.gov/sites/ppmc/articles/PMC2492885/