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| a series of paired nerves that originate in the spinal cord and emerge, branching out to the region of the neck, trunk, or limbs |
| the expanding and contracting opening in the iris of the eye, through which light passes to the retina |
erythroblast e·ryth·ro·blast (ĭ-rĭth'rə-blāst')
n.
Any of the nucleated cells normally found in bone marrow that develop into red blood cells.