In some quality-control crosses for our Df(3L)ED4288 stock, I found that Usp5A10 is lethal in combination with Df(3L)ED4288 or Df(3L)BSC672, and Cht7MI12799 is lethal in combination with Df(3L)ED4288, Df(3L)BSC386, Df(3L)BSC367 or Df(3L)BSC672.