How many anticodons?

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Science  21 Oct 1977:
Vol. 198, Issue 4314, pp. 319-320
DOI: 10.1126/science.910132


Much new information on codon composition is becoming available from the sequencing of molecules of DNA and RNA. The "wobble rules" for codon-anticodon pairing are applicable to this information. These rules provide for only 54 anticodons to pair with 61 codons, because the base A is not found in the first position of anticodons.