One of the mysteries of the English language finally explained.
1The taking and recording of the footprints of an infant, as a means of identification.
2Molecular Biology. More fully "DNA footprinting", "DNase footprinting", "genomic footprinting". Any of various techniques used to determine the sites at which proteins bind to DNA or RNA, employed especially in the study of gene expression and regulation. Frequently attributive Compare "footprint".
1920s; earliest use found in The American Magazine. From footprint + -ing.
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