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.
Skin Color and Where It Comes from. Melanin is a pigment that is produced by specialized skin cells called keratinocytes. How much you have and how it's distributed determines your skin's tone.The more melanin you have, the darker your skin will be.elanin is a pigment that is produced by specialized skin cells called keratinocytes. How much you have and how it's distributed determines your skin's tone.