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Complementarity of S15 mRNA to 18S rRNA. The secondary structure of the 18S rRNA at nucleotides 1835–1865 is represented as determined in situ by Holmberg et al. (21). Vertical lines indicate base-pairing, and ○ represents GU base-pairing. The positions at which the S15 mRNA (nucleotides 62–83) is complementary are indicated by the boxed nucleotides.
