As modern genetics developed, it became clear that this idea was in most cases wrong.[5] Cases such as Dolly (the famous cloned ewe) which, via somatic cell nuclear transfer, proved that adult cells retain a complete set of information – as opposed to Weismann's increasingly determined gradual loss of genetic information – putting this aspect of Weismann's theory to rest as a general rule of metazoan development. However, genetic information is readily lost by somatic cells in some groups of animals through somatic genome processing. The best known example are the nematodes, in which the phenomenon of chromatin diminution was first described by Theodor Boveri in 1887.[6]