Rachel A communication to FlyBase. I have just checked some pictures of Df(1)ras59 heterozygotes made by Yong Zhang. FB has: \*B 9E1;9F10-9F11 \*B ??? 9A;9F10-9F11 \*B 9E1;9F10-9F11 my reading of the chromosomes is that: \*B 9A;9F10-9F11 is correct. Michael Ashburner