Additional file 2.

An epithelial fold develops during the third instar developmental stage between the notum and wing hinge territories of the wing disc. The fold is located at the distal border of the Iro-C expression domain. Green: Actin; red: Ara/Caup. (A, B) Early and mid third instar wing discs showing the epithelial fold arising at the distal border of the ara/caup expressing domain (arrowheads). (C, D) Conventional and optical z section views, respectively, of the notum (n) – hinge (h) interface of a late third instar wing disc. ara/caup-expressing cells reach to the bottom of the fold (arrowhead). Dashes mark the approximate plane of the reciprocal view. Images A and B courtesy of Ruth Diez del Corral.

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Villa-Cuesta et al. BMC Developmental Biology 2007 7:106   doi:10.1186/1471-213X-7-106