Figure 4.Gr43a is expressed in a subpopulation of Crz expressing neurons in the brain. Whole brain preparation of Gr43aGAL4;UAS-mCD8GFP fly stained with anti GFP and anti Crz antibody.40 Crz (red) is expressed in all of the Gr43aGAL4 positive neurons (green); note the presence of 4 to 6 additional Crz expressing cells in each hemisphere that do not express the fructose receptor.