The test uses levels of plasma amyloid-β to estimate the buildup of protein plaques in the brain.

Murine neural tubes, with each image highlighting a different embryonic tissue type (blue). The neural tube itself (left) grows into the brain, spine, and nerves, while the mesoderm (middle) develops into other organs, and the ectoderm (right) forms skin, teeth, and hair.

Neuroscientist Geoffrey Raisman pioneered the study of spinal cord injury and the use of cell transplants to repair the damage.

Neurons in the lamprey spinal cord can sense pH and counteract changes from the body’s optimal range.