English: Fluorescence microscopy picture of cortical neurons in a primary culture from E18 rat, grown in supplemented Neurobasal Medium. On DIV 2, the cells were transduced with two adeno-associated viruses [AAV9.hSyn.TurboRFP and AAV9.CamKII0.4.eGFP] that express red and green fluorescent proteins under the controls of the Synapsind and the CamKII promoters. Picture is taken DIV 7.