Dear Min-Hui,

Thank you for your interest in the Waxholm Space Atlas of the Sprague Dawley Rat Brain.

By "left and right hemispheres of the brain were delineated individually", we meant that both the left and the right side of the brain was traced as they actually look like in the underlying image material, rather than delineating only on one side and then mirroring the atlas as you can find in some other atlases. The delineations are not cut into left and right side. 

Best regards,
Eszter