Arabinogalactan protein-extensins (AGPEs) in the infection thread matrix in the symbiotic nodules of Pisum sativum. (A) AGPE labeled with MAC265. (B) High magnification of the boxed area in (A). (C) AGPE labeled with MAC204. (D) High magnification of the boxed area in (C). (E) AGPE labeled with MAC236. (F) High magnification of the boxed area in (E). Low-temperature embedding in LR White, immunogold localization, transmission electron microscopy. id—infection droplet, it—infection thread, itw—infection thread wall, b—bacterium, rb—released bacterium, ba—bacteroid. Arrows indicate remnants of the infection thread wall. Bars = 500 nm.