This image depicts the chemical structure of cytosine. It shows a hexagonal ring with nitrogen atoms at positions 1 and 3, and a primary amine group attached to carbon 4. The two remaining positions ...

Other combinations of the atoms form the four bases: thymine (T), adenine (A), cytosine (C), and guanine (G). These bases are the rungs of the DNA ladder. (It takes two bases to form a rung -- one ...

DNA is composed of building blocks called nucleotides, each of which carries one of the following bases: adenine, guanine, thymine or cytosine. These bases are the individual letters that make up ...

With the arrival of a new class of single-nucleotide editors, researchers can target the most common type of pathogenic SNP in humans. Now, researchers at Harvard University have designed a new class ...

DNA methylation is a fundamental epigenetic mechanism in which a methyl group is added onto a nucleotide, commonly cytosine. DNA methylation affects many biological processes, including gene ...

Six of these polymorphisms are single base pair substitutions, although one involves the simple repeat of cytosine residues at nt 311–315. The CRS has five residues in this repeat, whereas most ...

Chemical structure of guanine, showing its double-ring purine structure and the functional groups involved in hydrogen bonding with cytosine. (Image: Public Domain) Guanine has the chemical formula ...

The cause is related to expansion of repeating DNA units, in which specific strings of genetic code-in this case, a series of cytosine-adenine-guanine nucleotides, or CAG, on one strand of the DNA ...