Atomic structure of the 50S Subunit from Haloarcula marismortui. Proteins are shown in blue and the two RNA strands in orange and yellow.[1] The small patch of green in the center of the subunit is the active site.
Atomic structure of the 50S Large Subunit of the Ribosome. Proteins are colored in blue and RNA in orange. The active site, adenine 2486 is colored in red. Image created from PDB id, 1s72 using PyMol
^ Ban N, Nissen P, Hansen J, Moore P, Steitz T (2000). "The complete atomic structure of the large ribosomal subunit at 2.4 A resolution". Science289 (5481): 905–20. doi:10.1126/science.289.5481.905. PMID 10937989.