title: An anonymous single copy chromosome 21 probe, DS21D2, associated with a frequent RFLP.
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D002904:Chromosomes, Human, 21-22 and Y; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D005787:Gene Frequency; D006801:Humans; D011110:Polymorphism, Genetic
chemical_list: D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI