3IZD 3IZD 3izd Model of the large subunit RNA expansion segment ES27L-out based on a 6.1 A cryo-EM map of Saccharomyces cerevisiae translating 80S ribosome. 3IZD is a small part (an expansion segment) which is in an alternative conformation to what is in already 3IZF. 3IZD-noatom