Genetic material: Abbr.
(Another definition for rna that I've seen is " Messenger".)
(Other definitions for dna that I've seen before include "Double-helix molecule (abbr.)" , "Substance that stores genetic information - often used by police" , "Genetic carrier" , "Briefly, substance in chromosomes used by police to identify criminals" , "Deoxyribonucleic acid (abbreviation)" .)