The restriction endonuclease map of the 25 S and 18 S ribosomal RNA genes of a higher plant is presented. Soybean (Glycine max) rDNA was enriched by preparative buoyant density centrifugation in ...

The triplication of a region of chromosome 21 around D21S55 in 21q22.2–22.3 has been involved in the main features of Down syndrome including mental retardation (Down syndrome chromosome region: DCR).