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| Symbol: Er; atomic weight: 167.26; atomic number: 68 |
| Symbol: Re; atomic weight: 186.2; atomic number: 75 |
nucleoside (n 'klē-ə-sīd') Pronunciation Key
Any of various compounds consisting of a sugar, usually ribose or deoxyribose, and a nitrogen base (a purine or pyrimidine). Nucleosides are constituents of the nucleotides of nucleic acids. Adenosine and thymidine are nucleosides. |