File:50S-subunit of the ribosome 3CC2.png|Three-dimensional representation of the [[50S]] ribosomal subunit. Ribosomal RNA is in brown, proteins in blue. The active site is a small segment of rRNA, indicated in red. | File:50S-subunit of the ribosome 3CC2.png|Three-dimensional representation of the [[50S]] ribosomal subunit. Ribosomal RNA is in brown, proteins in blue. The active site is a small segment of rRNA, indicated in red. |