Original photographs by Ansel Adams are defined as photographs printed by Ansel Adams from the negatives he made (photographed and developed). Most will range between $4,000 and $70,000.
Keratosis is the term for any condition that is a benign overgrowth  and thickening of the epidermis.
Epidermis is divided into the following 5 sublayers or strata: 1  Stratum corneum. 2  Stratum lucidum. 3  Stratum granulosum. 4  Stratum spinosum. 5  Stratum germinativum (also called stratum basale).