FB2024_04 , released June 25, 2024
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Coulthard, A.B., Alm, C. (2010.7.21). eIF-4B and CG41311 mis-mapped in FlyBase. 
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FBrf0211310
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Personal communication to FlyBase
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eIF-4b is on the third chromosome, not the second chromosome as stated in FlyBase.
If you look at Figure 3 in Hoskins 2007 (FBrf0200204), they mention that contig CP000217 was initially misplaced. ("CP000217, originally identified as part of 2RHet but subsequently mapped to 3LHet.")  If you download the supplemental material and search for eIf4b you will find it in CP000217. I believe CG41311, a withdrawn gene model, was also misplaced in 2Rh because it is in the same contig.
I showed through diagnostic PCR that CG41311 and eIF-4B are present in Df(2R)247.  These results are consistent with the misplacing of contig CP000217.
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Related Publication(s)
Research paper

Sequence finishing and mapping of Drosophila melanogaster heterochromatin.
Hoskins et al., 2007, Science 316(5831): 1625--1628 [FBrf0200204]

Essential loci in centromeric heterochromatin of Drosophila melanogaster. I: the right arm of chromosome 2.
Coulthard et al., 2010, Genetics 185(2): 479--495 [FBrf0211235]

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