human skin epidermal keratinocytes, the primary cell type of the epidermis, the outermost layer of the skin. Keratinocytes play a crucial role in maintaining skin integrity, as they form the primary protective barrier against environmental stressors, contribute to skin immunity, support wound healing, and help regulate cellular response to oxidative stress. The image shows that a few cells appear to be actively dividing, as indicated by their slightly enlarged size and being out of focus as they duplicate their genetic material and prepare for cell division. Mehr sehen