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A plant infected with tobacco mosaic virus
Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
Mosaic glass bowl, fused and slumped, Roman.
Rubella rash in a young child. Rubella is also called 3-day measles or German measles.
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin