The genomes from three mammals (human, mouse, and rat), two worms, and several yeasts have been sequenced, and more genomes will be completed in the near future for comparison with those of the major model organisms. Scientists have used various methods to align and compare the sequenced genomes to address critical issues in genome function and evolution. This review covers some of the major ne...

micrornas (mirna) are a class of noncoding and regulatory rna molecules about 22 nucleotides in length. micrornas regulate gene expression by an rna interfering pathway through cleavage or inhibition of the translation of target mrna. many mirnas have been reported for their important roles in developmental processes in various animals, but there is limited information about cattle and sheep mi...