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1 Parkinson disease Description Parkinson disease is a progressive disorder of the nervous system The disorder affects several regions of the brain especially an area called the substantia nigra th. 1 How Genes Work 1 What are proteins and what do they do? Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for t 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 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 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 Isolated Duane retraction syndrome Description Isolated Duane retraction syndrome is a disorder of eye movement. This condition toward the eartoward the ear toward the nosetoward the nose retractsr 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 Dyskeratosis congenita Description Dyskeratosis congenita is a disorder that can affect many parts of the body. There are three features that are characteristic of this disorder: fingernails and to 1 Terminal osseous dysplasia Description Terminal osseous dysplasia is a disorder primarily involving skeletal abnormalities and certain skin changes. It is a member of a group of related conditions 1 EGFR gene epidermal growth factor receptor Normal Function The EGFR gene provides instructions for making a receptor protein called the epidermal growth factor receptor, which spans the cell memb 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 X-linked severe combined immunodeficiency Description SCIDSCID immune system that occurs almost exclusively in males. Children with X-linked SCID are prone to recurrent and persistent infections be 1 Pantothenate kinase-associated neurodegeneration Description Pantothenate kinase-associated neurodegeneration (formerly called Hallervorden-Spatz syndrome) is a disorder of the nervous system. This 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