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Ribosomes are the large, ribonucleoprotein factories in which proteins are synthesized. In this process, messenger RNA (mRNA) codons are read by the anticodons of adaptor, transfer RNAs (tRNAs) that carry codon-specific amino acids. These amino acids are added to a growing protein chain by peptide bond formation in the heart of the ribosome. The massive, macromolecular assemblage at left is the crystal structure of the 70S ribosome from Thermus thermophilus, a highly thermophilic bacteria first discovered in deep-sea hot vents.The structure contains 42 proteins and 3 ribosomal RNAs (rRNA).