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A dermoid cyst is a collection of tissue under the skin. It may contain hair follicles, oil, and sweat glands.

Detailed information on structural abnormalities, including chromosome deletions and duplications.

To look for single gene defects, healthcare providers look at the DNA to see if it has any errors in it. Errors are known as mutations.

Detailed information on translocation Down syndrome

Detailed information on trinucleotide repeats, including fragile X syndrome.

Detailed information on uniparental disomy, including information about Prader-Willi syndrome and Angelman syndrome.

Genetic testing can help find diseases that run in a family or don't yet have symptoms.

Did you have chickenpox or get the vaccine as a child? Then you've got nothing to worry about from varicella. But if you didn't, you may not be immune to this infectious disease that can cause complications for a pregnant person and their baby. Read more to find out why, and how to protect yourself.

Diphtheria, pertussis, and tetanus are serious illnesses. A combination vaccine is given to babies and children to provide protection against all three diseases.