Samples collection and overlap in top 5% highly expressed genes. (A) Mechanical severing of dendrites from neurons. Rat hippocampal neuron with the soma (red arrow) and dendrites (red circle) before and after aspiration by a glass micropipette of the soma. (B) Venn Diagram of overlap in gene identity of the top 5% of the highly expressed genes. Within the top 5% highly expressed genes, ~19% (105) genes of C57/BL6 and ~12.5% (70) genes of Balb/c overlap with rat genes, and ~58% (312) genes of C57BL/6 overlap with Balb/c genes.