Technician dissecting a human brain. A technician divides a human brain into right and left hemispheres. It has been donated for medical research at the Harvard Brain and Tissue Resource Centre, USA. One half is preserved in formalin and stored for anatomical study. The other half is sliced into sections and frozen for genetic and biochemical study. The Harvard Brain and Tissue Resource Centre is the largest brain bank in the world. It stores over 3,000 healthy and diseased brains, which are available to researchers studying disorders such as Parkinson's disease, Alzheimer's disease and schizophrenia.