From the banding pattern seen in mitotic preparations for Bloomington stock 1396 (which contains Dp(3;1)P115 carried on the C(1;Y)8 chromosome), the third chromosome segment in Dp(3;1)P115 is inserted distal to bb.
Dp(3;1)P115/Dp(3;3)P5 larvae have dorsal histoblast cells in T3. The anterior dorsal histoblast nests are sometimes inverted in Dp(3;1)P115/Dp(3;3)P5 flies.
From the banding pattern seen in mitotic preparations for Bloomington stock 1396 (which contains Dp(3;1)P115 carried on the C(1;Y)8 chromosome), the third chromosome segment in Dp(3;1)P115 is inserted distal to bb.