Fig. 2. Outgrowth of Kenyon cells (A,A') and projection neurons (B,B') after 2 (A,B) and 6 (A',B') days in primary cell culture. The neurons start to grow processes after 1 day in vitro. These neurites continue growing and branching throughout the period of 1 week. The somata diameters of projection neurons are larger and they grow longer neurites with more branches. Phase contrast; primary magnification 32x. Scale bars, 20µm.