Abstract
Several HindIII monomer units of a tandemly repeated nuclear DNA sequence of Brassica campestris and Brassica juncea (Cruciferae) have been cloned and sequenced. The monomer units, of 177 bp length, are AT-rich and share 88% homology between themselves and more than 65% homology with similar repeats of other Cruciferae like Brassica oleracea, Sinapis alba and Raphanus sativus. Thus unlike the rapid divergence of tandemly repeated satellite DNA in other organisms, this DNA element is highly conserved thus indicating its importance.