Has a sixth DNA base been discovered?

th-3Most textbooks talk of four DNA bases. Later research has shown there to be five. No, wait, cross that out, there could be six. Scientists suggest that the methyl-adenine is the sixth base and that it is medically important.  DNA (deoxyribonucleic acid) is the main component of genetic material, found in humans and all other animals. DNA is formed by combining four parts or bases. These are coded A, C, G and T (representing adenine, cytosine, guanine and thymine). The combination of these leads to thousands of possible sequences. This variation explains the genetic variability found across and throughout living creatures. Read Article