'RALPH C. EAGLE, JR.' / SCIENCE PHOTO LIBRARY 'RALPH C. EAGLE, JR.' / SCIENCE PHOTO LIBRARY
Tay-Sachs disease (abbreviated TSD, also known as GM2 gangliosidosis, Hexosaminidase A deficiency or Sphingolipidosis) is a genetic disorder, fatal in its most common variant known as Infantile Tay-Sachs disease. All patients with Tay-Sachs disease have a ''cherry-red'' spot, easily observable by a physician using an ophthalmoscope, in the back of their eyes.
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