The Brca1 protein binds best to four - way branched structures of DNA — one shape it assumes while it's being repaired. (sciencemag.org)
Others, like that of Stigmatella aurantiaca, are more complex branching structures in which some cells form the support structure and only some get to form spores. (newscientist.com)
On one side are people who want a traditional local branch structure with locally - elected delegates going to national policymaking meetings. (democraticaudit.com)