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Cockayne syndrome is a rare disorder characterized by an abnormally small head size, a failure to gain weight, and rise at the same pace that causes to very short stature, and delayed growth. The skin's most vulnerable people have an elevated sensitivity to sunlight, and in some cases even a small amount of sun exposure can result in a sunburn or blistering of the skin. People with Cockayne's syndrome are sensitive to metronidazole, an antibiotic drug. If impacted individuals take this medication, it can result in life-threatening liver disease. Cockayne syndrome is sometimes divided into types I, II, and III based on the severity and age of symptoms. While some scientists believe it to be a distinct but similar disease, others see it as part of the Cockayne syndrome disease spectrum.
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