OSA | Living History

Four-color DNA sequencing identifies the order of nucleotides in a DNA fragment. Red, blue, green and yellow represent one of the four DNA nucleotides.

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Four-Color DNA Sequencing

Four-color DNA sequencing identifies the order of nucleotides in a DNA fragment.

Fragments treated with fluorescent dyes emit red, yellow, blue or green light when activated by a laser. Each color represents one of the four DNA nucleotides. (Photo: iStock.com/Gio.tto)

(Courtesy of iStock.com/Gio.tto)