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SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Scientist examining DNA sequencing autoradiogram on a light box. Each group of four strips represents the nucleotide sequence of AGCT (Adenine-Guanine-Cytosine-Thymine) in the DNA of the nematode worm, Onchocerca volvulus, a human parasite responsible for cutaneous onchocerciasis and river blindness in tropical countries.
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