Proposed secondary structures of Saccharomyces SRP RNAs. Models of the RNAs of S. kluyveri, S. cerevisiae and Y. lipolytica are shown. Saccharomyces RNAs have regions, 5c-g and 5h-i (shaded) not found in other fungi. Inset with shaded background with helices 5c-g are showing compensatory base changes in this domain (bases with white background). Also indicated is the location of the 5c-g insert as related to Yarrowia (arrow) as well as conserved sequence elements of the fungal Alu domain (box). The complete models of other Saccharomyces species are shown in the web supplement at http://bio.lundberg.gu.se/srp03/.