Lack of cardiovascular pathology in SIVagm-infected AGMs. Histological investigations of kidney (A), brain (B), lung (C), intestine (D), aorta (E), and heart (F) in chronically SIVagm-infected AGMs failed to identify cardiovascular lesions. Slides were visualized with a Carl Zeiss Axio Imager M1 microscope using the following objectives: 10×/0.3 DICI Plan Neofluar, 20×/0.8 DICII Plan Apochromat, and 40×/0.75 DICII Plan Neofluar. Micrographs were taken with a Carl Zeiss AxioCam MRc5. Images were aquired and analyzed by using Carl Zeiss Axio Vision SE64 Release 4.8.2. The original magnification of all the pictures was 400×. Images were cropped with Adobe Photoshop CS6.