Editor's note: A Page One story and accompanying headline in yesterday's Globe about blocked fire exits in the Big Dig tunnels incorrectly said that many had been boarded up or blocked because of work to find and plug leaks in the tunnels. That assertion was not attributed to anyone or supported by other reporting, a breach of the Globe's standards. The exits are boarded up because they lead to areas of the Big Dig that are still under construction, according to Big Dig officials. In addition, the story incorrectly said the exits are the main escape route for motorists if a fire starts inside the tunnels. Big Dig officials say the primary evacuation route is for motorists to go back the way they entered the tunnels.
Correction: Because of a reporting error, a story on yesterday's World page about an AIDS drug incorrectly stated the affiliation of Dr. Mark W. Kline. He is an AIDS specialist at Baylor College of Medicine in Houston.
Correction: Because of an editing error, a photo caption that accompanied a Page One story yesterday about the beating of a teenage girl at an MBTA stop in Milton incorrectly identified two of the police officers shown. The pair were not both MBTA police officers. Joe Ryan is an MBTA Transit Police officer, and Mark Conrad is a Milton police officer.
Omission: Because of an editing error, Richard Feldman's credit was missing from the photograph that accompanied yesterday's Weekend section review of ''Olly's Prison."
Correction: Because of editing errors, the captions for two paintings by Ruta Smilskalns, ''Turquoise and Green -- 'Tippy Toes' " and ''Pale Yellow and Gray," were transposed in a profile of the painter in yesterday's Weekend section. Also, the title for ''Turquoise and Green -- 'Tippy Toes' " was rendered incorrectly.
Correction: Because of incorrect information provided to the Globe, an incorrect opening date for the movie ''Up and Down" was published in yesterday's Weekend section. The movie is expected to be in theaters April 29.
Correction: Because of a graphic artist's error, the map of Rome that accompanied a story in Thursday's World pages on security for the funeral of Pope John Paul II incorrectly located the Basilica of Santa Maria Maggiore. It is next to the main train station.
Clarification: A story on Wednesday's Real Estate page about development and marketing efforts in Somerville suggested that the MBTA's Green Line would be extended through Somerville into Medford. In fact, although the city is making plans with the Green Line extension in mind, the MBTA has not made a final decision on the extension.
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