The researchers used human brain neurons writing ink

These paintings look like a tree, but these "tree" is not a real plant, but neurons that form the human brain cells.
picture 1 ：Shows the cells in the retina
picture 2 ：Show that the human hippocampus in the cells, the hippocampus is responsible for memory and navigation of the important brain regions.
 picture 3 ：Shows the place near the cerebral cortex, cerebral cortex is a layer of tissue, it is considered in terms of human perception plays a vital role.