Illustration of human gamma interferon as a glass surface model with indicated deeper ribbon model on dark background. Gamma interferon is produced by TH1 cells after contact with a macrophage that has incorporated (phagocytosed) bacteria. The main function of interferon-gamma is to activate macrophages and thereby strengthen cellular defenses. These macrophages increase the production of nitric oxide, which is toxic to bacteria, and reactive oxygen radicals. Furthermore, macrophages activated in this way enhance the fusion of phagosomes with lysosomes inside them. The illustration is based on structural data from Samudzi, C.T., Rubin, J.R., by medicalgraphics/F1online

Photo website with Rights Managed and Royalty Free stock photos, images, illustrations and footage available for download immediately for commercial and editorial uses. Aflo is a leading independent supplier and producer of stock pictures and visual content. Search and find high quality images and video for design, print, web-use and publishing. Buy photos from our extensive collection of model released and property released sports images. Search some of the most beautiful travel and landscape pictures from our own photographers and license from our large collection of content, modern and archive, focusing on Japan. We provide free research. Register for personal account management and for full use of our Stock Photography website and start to download images now.