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How DNA became evidence: the method, the record, and the limits of a profile.

Section 5 of 6

The Instruments

The machines, in the order they arrived. A film read by eye, a block that heats and cools, a bundle of fine tubes, and a box that needs no laboratory at all.

FIG. 01A framed autoradiograph film beside a handwritten laboratory notebook page detailing a DNA experiment
The early output was a film, read by eye, and its bands are the image everyone still pictures.Photo: Autoradiograph of the first genetic fingerprint, 1984 Wellcome L0059823 · Wikimedia Commons