Fig. 4.
MEF2 is expressed in Kenyon cell descendants from all four mushroom body neuroblasts. (A) A cartoon of the adult MB in a sagittal plane, with anterior to the right. The black horizontal line represents the approximate plane of the section shown in B. (B) A near-horizontal section from a heterozygous mef226-49 adult shows immunoreactivity (brown) in all four axon bundles of the posterior pedunculus. In the mirrored image, the four axon bundles arising from the Kenyon cells are numbered and the antennal lobe (AL), fan-shaped body (FB), ellipsoid body (EB), and MB lobes (β and γ) are outlined. More than five flies were confirmed to have similar results.