The three exposed nitrogen bases on a strand of tRNA are known as the anticodon. This group of three bases can consist of any of the four types of nitrogen bases found in RNA: cytosine, guanine, adenine and uracil.
The three exposed nitrogen bases in the anticodon match the three complementary bases on a strand of mRNA, known as the codon. The mRNA, or messenger RNA, and tRNA, or transfer RNA, work together to create new proteins through a process known as DNA translation. The mRNA is the chain that carries the message about the specific type of protein that is to be produced.