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Trinucleotide Repeats: Fragile X Syndrome What are trinucleotide repeats? DNA is the chemical that makes up your genes. It contains a "code" of 3-letter words known as codons or trinucleotides. Many genes normally contain trinucleotide sequences that repeat. These are called

Low-Vision Devices What is low vision? Low vision is a condition that means your vision can't be helped with traditional eyeglasses, contact lenses, intraocular lens implants, or corrective surgery. But in some cases, people with low vision may get help with special visual

Anatomy of a Newborn Baby's Skull The skull may seem to be one large bone, but it's made of several major bones that are connected together. The major bones that compose the skull include: 2 frontal bones 2 parietal bones 1 occipital bone These bony plates cover the brain, and

Medical Genetics: Types of Genetic Changes The human body has about 20,000 different genes in each cell. Genes are located on chromosomes, which are stick-shaped structures in the middle of the cell (nucleus). Each cell usually has 46 chromosomes grouped in 23 pairs. Each gene

Risks of Pregnancy Over Age 30 Many women wait until later in life to have children. In the U.S., birth rates for women in their 30s are at the highest levels in four decades. But an older mother may be at increased risk for things such as: Miscarriage Birth defects Twins High

Tests to Diagnose a Stroke How is a stroke diagnosed? Your healthcare provider will ask you about your health history. They will give you a physical exam. You may also have these tests to diagnose a stroke. Imaging tests of the brain CT scan. This test uses X-rays and a computer

Fibrocystic Breast Changes What are some common fibrocystic breast changes? Fibrocystic breast changes are symptoms you may feel in your breasts right before your period. Your breasts may feel lumpy, swollen, or sore. This is a very common condition. It is not a disease. It is

Diagnosis of Cystic Fibrosis How is cystic fibrosis diagnosed? Newborns are screened for cystic fibrosis (CF) as part of each state's newborn screening program. If the results are positive, it does not mean your baby has cystic fibrosis. More tests are done as described below. In

Understanding Risks of Medicines in Pregnancy When you are pregnant, always check with your healthcare provider or midwife before taking any prescription or over-the-counter medicines. This includes herbs and dietary supplements. All medicines affect the baby. How they affect the

When to Get an Eye Exam What's an eye exam? During an eye exam, an eye healthcare provider looks at your health history and gives you a series of eye tests. The tests are done to check the health of your eyes. They check for problems that can develop over time, such as glaucoma