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.
We all have pigment-producing cells in our skin called melanocytes. These melanocytes produce melanin pigment and feed it to keratinocytes, the normal skin cells that form the outer barrier of our skin.This barrier protects us from the insults of nature, and importantly, from the sun.This pigment prevents us from being damaged by the sunâs powerful rays.hese melanocytes produce melanin pigment and feed it to keratinocytes, the normal skin cells that form the outer barrier of our skin.This barrier protects us from the insults of nature, and importantly, from the sun. This pigment prevents us from being damaged by the sunâs powerful rays.