Colocalization of GFP (green) and in vivo MegaFectin complexes (red) in spleen, lungs, and liver of a macaque. Two days after intravenous injection of GFP/MegaFectin complex, the animal was killed, tissues were collected, and fixed or frozen sections were examined to visualize distribution with use of confocal microscopy of spleen (left column), lungs (middle column), and liver (right column).