Now these other purple cells are our stem cells. And these stem cells found within the Stratum basil are responsible for differentiating for becoming our caroteneocides. So these stem cells differentiate into caroteneocides. And as these caroteneocides progress, as they begin to secrete produce our carotene, they begin to move up along the epidermis. So eventually they move up into this section, which is the Stratum spinosum. So these rat cells are basically the living keratinocytes.