<em>The next time you wake in the middle of the night and need to make a trip to the kitchen or the restroom, cover one of your eyes with your hand before turning on any lights. You'll save the night vision (a.k.a. Sharingan) in that eye. The effect is trippy.</em>
This is because the melanocytes are located in the stratum basale. Lighter-skinned people usually have low basal levels, and exposure to UV radiation causes an increase which makes skin darker.
<span>Depressants............</span>
When an ion or a molecule passes through a membrane without something facilitating, or encouraging that passage, such as a protein does. What drives it is the force of the diffusion itself instead.