IUPAC definition : (chromatography) a reference substance co-chromatographed with the sample to assist
in identifying the components.; (genetic) a genewith known phenotype and mapped position.; (dna) a fragment of known size used as reference for analytical purposes.;
(chromatography) a reference substance co-chromatographed with the sample to assist
in identifying the components. (genetic) a genewith known phenotype and mapped position. (dna) a fragment of known size used as reference for analytical purposes.