Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Mail Stop 64R0121, Berkeley, CA 94720, USA. cjm@fruitfly.org|Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Mail Stop 64R0121, Berkeley, CA 94720, USA. cjm@fruitfly.org|Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Mail Stop 64R0121, Berkeley, CA 94720, USA. cjm@fruitfly.org