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Cover: An epidermal impression of a cotton leaf made on a cellulose acetate butyrate plate and scanned with a high resolution benchtop scanner. The foreground displays a false color image of an epidermal impression of a whole cotton leaf. The background is a negative image of a region of the same impression, susequently colorized. Gitz and Baker (232–236) discuss the creation and use of these slides to assess stomatal density, a primary determinant of yield. Photo credit: Dennis Gitz.