Fig 2. Front view of the 3D brain unit. Definitions of Upl are given. The x-directed, y-directed and z-capillaries are divided by the lines x = y (or y = z or x = z) and x+y = yr (or y+z = zr or x+z = zr). The only exceptions for this are the brain capillaries adjacent to Uin and the brain capillaries adjacent to Uout.
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