"Val-4", "Val-3a" and "Val-3b" tRNA genes mapped to 84D are shown in Fig 1. There are 4 "Val-3b" confirmed tRNA annotations in 84D (also see FBrf0033555, as referenced by the current paper), but no annotations corresponding to "Val-4" or "Val-3a" in 84D - annotations for these isotypes map elsewhere in the genome. So, we assume the illustration of "Val-4" and "Val-3a" tRNA genes mapping to 84D is an error and that they do not really exist at this location.