Guanine nucleoside analogues, Nucleoside analogues and Antiviral drugs

The number of nucleotides (and base pairs) varies from species to species. However, the number of DIFFERENT nucleotides is 4:

- adenine nucleoside phosphate

- cytosine nucleoside phosphate

- guanine nucleoside phosphate

- thymine nucleoside phosphate

A dog

The components of a nucleoside are:

A pentose sugar(generally ribose or deoxyribose), and

a nitrogenous base which may be Adenine/Guanine/Thymine/Cytosine/Uracil.

It becomes a nucleotide on addition of a phosphate group.

An aminonucleoside is any form of a nucleoside derived from an amino sugar.