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Stem cells are special human cells that have the ability to develop into many different cell types, from muscle cells to brain cells. In some cases, they also have the ability to repair damaged tissues.

Roundworm infection is a type of parasitic illness. This is an illness in which an organism lives inside the body of another creature. The worms live and grow inside the body and may cause symptoms.

Scrotal swelling is a common problem in baby boys and young boys. It can have many causes. These are often divided into painless and painful scrotal swelling.

Epididymitis is an inflammation or infection of the epididymis. This is a thin, coiled tube that sits on top of a male testicle. In younger boys, this condition can be caused by a urinary tract infection. In older boys and teens, it's often caused by a sexually transmitted infection (STI).

Red blood cells play an important role in your health by carrying fresh oxygen all over the body.

White blood cells, red blood cells, and platelets are essential to body function, but plasma also plays a crucial, and mostly unrecognized, job. It carries these blood components throughout the body as the fluid in which they travel.

Dyskeratosis congenita is a rare disease that's present at birth. Learn more about the causes, symptoms, diagnosis, treatment, and complications.

Campylobacter infection is a mild to serious digestive illness. It is caused by bacteria. Symptoms often include cramping, diarrhea, belly pain, and fever.

Walking pneumonia is a mild form of pneumonia. Children with walking pneumonia may feel very tired and run down. But they may still be able to do many of their normal daily activities.