50S, koja je ekvivalentna sa 60S ribozomalnom podjedinicom eukariotskih ćelija, je velika podjedinica 70S ribozomaprokariota. 50S podjedinica se prvenstveno sastoji od proteina ali isto tako sadrži i jednolančanu RNK poznatu kao ribozomna RNK (rRNK). rRNK formira sekundarne i tercijarne strukture kojima se održava aktivna struktura ribozoma.
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