What are the call letters of the public television station in San Francisco?

KQED was co-producer of the television adaptation of Armistead Maupin's novel, Tales of the City, which aired on PBS stations nationwide in January of 1994. The six-part miniseries stirred controversy because of the homosexual themes, nudity and illicit drug use in this fictional portrayal of life in 1970's San Francisco. The controversy led to calls from the public to cancel the series, a bomb threat at the Chattanooga, TN PBS Station, WTCI (the station pulled the program an hour before airtime) and threats from state and federal governments to cut funding for the network and its stations. Although the program gave PBS its highest ratings ever for a dramatic program, the network decided not to participate in the television production of the second book of the series, More Tales of the City.