title: Computer searches.
abstract: In Eliot Marshall's News & Comment article "South Africa blocks AAAS visit" (29 Apr., p. 595), the National Medical and Dental Association was mistakenly named as being among the 17 organizations banned by the South African government on 24 February 1988. Among the organizations that were banned were the South African Trade Unions, the United Democratic Front, the Detainees' Support Committee, and the Detainees' Parents Support Committee.
mesh_terms: D000818:Animals; D007256:Information Systems; D012106:Research / Q000592:standards