Body colour: flies carrying yTDH-4b (in a y- background) have a pigmentation score of 1 (where 1 = absence of y expression and 5 = wild type) in both the body and wing. Body colour: yTDH-4b/y1#8 flies have a pigmentation score of 1 in both the body and wing. Body colour: yTDH-4b/y59b flies have a pigmentation score of 1 in both the body and wing. Body colour: yTDH-4b/y2 flies have a pigmentation score of 1 in the wing and 1-2 in the body.