DNA Is Written in an Alphabet of Only Four Bases

A truly gap-free human genome sequence was only published in 2022.

The tiny remaining difference accounts for the variation between individuals.

That is roughly 3.1 billion of the chemical letters that make up a person's DNA.

Their model relied on X-ray images by Rosalind Franklin, and Watson, Crick and Maurice Wilkins won the Nobel Prize in 1962.