Nucleic Acid Abbreviations

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Name Symbol
3-Letter 1-Letter
Adenine Ade
Adenosine Ado A
Bromouridine BrUrd B
Cytosine Cyt
Cytidine Cyd C
Dihydrouridine H2Urd D or hU
Guanine Gua
Guanosine Guo G
Hypoxanthine Hyp
Inosine Ino I
Mercaptopurine Syp or Shyp
Nucleoside Nuc N
Orotate Oro
Orotidine Ord O
Purine Pur
Pyrimidine Pyr
Purine nucleoside Puo R
Pyrimidine nucleoside Pyd Y
Ribothymidine Thd T
Thioinosine Sno or SIno M
Thiouracil Sur or SUra
Thiouridine Srd S or SU
Thymine Thy
Uracil Ura
Uridine Urd U
Xanthine Xan