Those are DNA sequences. Each sequence of three bases in a DNA strand is called a codon. Each codon codes for a particular amino acid. So for example the codon AGC stands for the amino acids serine. The codon TGG stands for the amino acids threonine. The codon CTG stands for aspartic acid. So, the DNA sequence AGCTGGCTG codes for the amino acid sequence serine-threonine-aspartic acid. I hope the helps! :)