15S RNA
\fˈɪftiːn z ˌɑːɹˌɛnˈe͡ɪ], \fˈɪftiːn z ˌɑːɹˌɛnˈeɪ], \f_ˈɪ_f_t_iː_n z ˌɑː_ɹ_ˌɛ_n_ˈeɪ]\
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The most abundant form of RNA. Together with proteins, it forms the ribosomes, playing a structural role and also a role in ribosomal binding of mRNA and tRNAs. Individual chains are conventionally designated by their sedimentation coefficients. In eukaryotes, four large chains exist, synthesized in the nucleolus and constituting about 50% of the ribosome. (Dorland, 28th ed)
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