Over a century ago, it was discovered that when a dye was injected into an animal's bloodstream, it appeared everywhere in the body, with two exceptions: the spinal cord and the brain.
Eka malembe ya dzana lama hundzeke, vaendli va ndzavisiso va xiye leswaku swilo leswi kumekaka eka nkhuluko wa ngati, swi nghena kun'wana ni kun'wana emirini, handle ka le byongweni ni le longweni.