A XXXX middle-repetitive DNA sequence which shares homology with @entity1 ubiquitous repeats.

@entity1 @entity1573 @entity18204 @entity19
We have identified and sequenced two members of a @entity1573 middle repetitive DNA sequence family. By reassociation kinetics, members of this family (termed @entity18204 ) are estimated to be present in 1500-7000 copies per @entity1573 haploid genome. The first family member sequenced (CRlUla) is located approximately 2 kb upstream from the previously cloned @entity1573 Ul RNA gene. The second @entity18204 sequence ( @entity18204 )Va) is located approximately 12 kb downstream from the 3' end of the @entity1573 ovalbumin gene. The region of homology between these two sequences extends over a region of approximately 160 base pairs. In each case, the 160 base pair region is flanked by imperfect, but homologous, short direct repeats 10-15 base pairs in length. When the @entity18204 sequences are compared with @entity1 ubiquitous interspersed repetitive DNA sequences ( @entity1 Alu and @entity19 Bl families), several regions of extensive homology are evident. In addition, the short nucleotide sequence CAGCCTGG which is completely conserved in ubiquitous repetitive sequence families from several @entity1 species is also conserved at a homologous position in the @entity1573 sequences. These data imply that at least certain aspects of the sequence and structure of these interspersed repeats must predate the avian- @entity1 divergence. It seems that the @entity18204 family may possibly represent an avian counterpart of the @entity1 ubiquitous repeats.
