21.   Resembling security screening devices used at airports, the irradiation systems can be configured to fit in existing postal centers.

22.   Sorting and stamping and sifting through mail is not what it used to be at the postal processing center in this western suburb of Boston.

23.   That trash contained discarded envelopes from a postal center in Washington that was contaminated with anthrax.

24.   That letter was processed at the same New Jersey postal center as the tainted letters mailed to two U.S. senators.

25.   The affected postal center in Kansas City does not process ordinary mail.

26.   The fulfillment services center and a smaller postal center next door will remain closed until both are decontaminated.

27.   The negative test results this week do not disprove the two positive findings of anthrax last week in a trash bag at the postal center.

28.   The postal center, which had remained open during the testing, is closed indefinitely.

29.   Traces of anthrax have been found at the Hamilton postal center.

30.   Two postal centers near her home, in Wallingford and Seymour, were scoured for evidence of anthrax spores on Wednesday.