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1 Cells and DNA 1 What is a cell Cells are the basic building blocks of all living things The human body is composed of trillions of cells They provide structure for the body take in nutrient. 1MelanomaDescriptionMelanoma is a type of skin cancer that begins in pigment-producing cells called melanocytes This cancer typically occurs in areas that are only occasionally sun-exposed tumors are 1 Psoriatic arthritis Description arthritisarthritis in combination with a skin disorder called psoriasis. Psoriasis is a chronic inflammatory condition characterized by patches of red, irritated ski 1 Ankylosing spondylitis Description Ankylosing spondylitis is a form of painful, ongoing joint inflammation (chronic inflammatory arthritis) that primarily affects the spine. Early symptoms of anky 1 Chronic myeloid leukemia Description Chronic myeloid leukemia is a slow-growing cancer of the blood-forming tissue (bone erythrocyteserythrocytes leukocytesleukocytes( thrombocytes) that are involv 1 Age-related macular degeneration Description Age-related macular degeneration is an eye disease that is a leading cause of vision loss in older people in developed countries. Subtle abnormalities i 1 Atopic dermatitis Description also known as atopic eczemaalso known as atopic eczema dermatitisdermatitis often disappears before adolescence. However, in some affected individuals the condition co 1 Alpers-Huttenlocher syndrome Description Alpers-Huttenlocher syndrome is one of the most severe of a group of conditions called the POLG -related disorders. The conditions in this group feature a 1 Dupuytren contracture Description Dupuytren contracture is characterized by a deformity of the hand in which the joints of extendedextended flexedflexed supports the body's muscles, joints, organs, 1 Ellis-van Creveld syndrome Description Ellis-van Creveld syndrome is an inherited disorder of bone growth that results in very dwarfismdwarfism lower legs and a narrow chest with short ribs. Ellis- 1 Autosomal dominant partial epilepsy with auditory features Description ADPEAFADPEAF form of epilepsy that runs in families. This disorder causes seizures usually auditoryauditory ringing. Some peop 1 Pantothenate kinase-associated neurodegeneration Description Pantothenate kinase-associated neurodegeneration (formerly called Hallervorden-Spatz syndrome) is a disorder of the nervous system. This 1 Familial hyperaldosteronism Description Familial hyperaldosteronism is a group of inherited conditions in which the adrenal glands, which are small glands located on top of each kidney, produce too 1 Hypertension Description Hypertension is abnormally high blood pressure in the arteries, which are the blood vessels that carry blood from the heart to the rest of the body. As the heart beats, it 1 Y chromosome infertility Description Y chromosome infertility is a condition that affects the production of sperm and causes male infertility, which means it is difficult or impossible for affected