Diabetes is a life-long disease marked by high levels of sugar in the blood.

It is a degenerative disease marked by good days and bad days, he said, "and researchers have to be very clever to be sure that their results are valid."

FP is a disease marked by proliferation of benign but debilitating cutaneous fibropapillomas and occasional visceral alien.

It is being used to study several diseases marked by excess of glutamine strings, he said.

George III probably suffered from porphyria, a rare hereditary disease marked by severe attacks of pain and mental instability.

RA is a chronic disease, marked by inflammation of the lining of the joints.

Maria Frias was a child of 11 when she learned that she had muscular dystrophy, an incurable genetic disease marked by progressive weakening of her muscles.

Periodontal disease, marked by inflammation, may increase inflammation throughout the body.

Tuberous sclerosis (an inherited disease marked by noncancerous fatty cysts in the kidney).

Affecting several thousand Americans each year, myocarditis is a disease marked by inflammation of the heart muscle (myocardium).