Crossword Genius

Its structure was evidenced by Photo 51, an X-ray captured in 1952

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Deoxyribonucleic acid (abbreviation)" , "Briefly, substance in chromosomes used by police to identify criminals" , "Substance that stores genetic information - often used by police" , "Substance in chromosomes that stores genetic information, used by police" , "Substance in chromosomes that stores genetic data" .)

I've seen this clue in The New York Times.
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