Personal communication from: Dirk Langehans, student in the laboratory of Christian Klaembt, Universitat Muenster. To: Bloomington Drosophila Stock Center Subject: Df(3L)Brd20 breakpoints Background: Cytology on an aberration in the collection for which no cytology had been previously reported. Information communicated: The breakpoints of Df(3L)Brd20 have been cytologically mapped to 70D2-3;71E3-5.