This research group was formed in 1995, and since then some of the main investigations have been on the proposal of a nearly neutral model of the evolution of B chromosomes. They have demonstrated, using DNA sequence analysis, the autosomal origin of these chromosomes in the grasshopper Eyprepocnemis plorans, which originate in the smallest autosome and Locusta migratoria, which in this case originate in the eighth autosome in order of size.