Trypanosomiasis refers to a group of diseases caused by Trypanosoma There are two types of trypanosomiasis that affect humans, they are divided according to their geographical location: African trypanosomiasis, or sleeping sickness, is caused by Trypanosoma brucei parasites in sub-Saharan Africa and is transmitted by the tsetse fly? (Glossina).
Specilized cells in the epidermis called melanocytes produce melanin, a dark pigment that provides skin color. Melanin absorbs ultraviolet radiation in sunlight and preventing mutations in the DNA of skin cells and other damaging effects.ifferences in skin color result from differences in the amount of melanin that melanocytes produce and the distribution and size of pigment granules. Skin color is genetically determined.
Cells involved in skin cancer. Skin cancer begins in your skin's top layer â the epidermis. The epidermis is a thin layer that provides a protective cover of skin cells that your body continually sheds.The epidermis contains three main types of cells: 1  Squamous cells lie just below the outer surface and function as the skin's inner lining. Basal cells, which produce new skin cells, sit beneath the squamous cells. 2  Melanocytes â which produce melanin, the pigment that gives skin its normal color â are located in the lower part of your epidermis. 3  Melanocytes produce more melanin when you're in the sun to help protect the deeper layers of your skin.