The distribution of CR1, and Alu-like family of interspersed repeats, in the chicken genome.

We have studied the distribution of CR1, a family of short interspersed repeats, in the chicken genome; this family is homologous to the AluI family of man and to the B1-B2 families of mouse. Hybridization with a suitable probe showed that the vase majority of CR1 are located on the heaviest major component (1.708) of the genome which only represents 9% of chicken DNA. Some repeats were also found on the 1.702 and 1.704 components, but none on the 1.699 component (components are denoted by their buoyant densities in CsCl). The GC content of the repeats, 48%, matches that, 47%, of the major component mainly harboring it.