First, there is an additional release flatfile, Pfam-C, which contains all of the clan information and a list of the Pfam families that are members of the clan. Second, all of the information is contained in the Pfam MySQL database that we make available for download.Third, clan information can be accessed via the websites. There are two web entry points to the clan information. A user can âbrowse byâ a list of clans or follow links from clan member families (Table 2).his represents 15% of Pfam families and as these tend to represent the larger protein families, account for 31% of the domain hits in Pfam. Clans help us to improve the annotation of families. For example, knowing the 3D structure of a domain is an essential part of understanding the biology of that domain.