Incubation period: In medicine, the time from the moment of exposure to an infectious agent until signs and symptoms of the disease appear. For example, the incubation period of chickenpox is 14-16 days. In biology, the incubation period is the time needed for any particular process of development to take place.
Epidermis is the surface epithelium of the skin, overlying the dermis. dermis is the layer of skin that lies beneath the epidermis and above the subcutaneous layer.
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