Figure 5.—

The right arm of the fourth chromosome and its subdivisions 102A–F. The position of three previously existing deficiencies, Df(4)M101-62f, T(1;4)sc^H, and Df(4)C3 is indicated. Below the fourth chromosome is a blowup of the region 102A6-102C4. Solid triangles indicate the positions of the P-element insertions used to generate the deficiencies and arrows indicate the coding sequences within the region. Df(4)A6-2b is the largest deficiency on the fourth chromosome isolated to date and the combination of this deficiency with Df(4)M101-62f uncovers virtually the entire right arm of the fourth chromosome.