Imagine a code made up of only four letters. How complicated could it get?
Complicated enough to hold the secrets to why some cells become part of a brain or heart while others become bones or skin or toes. A code that dictates hair and eye color and determines whether ear lobes are attached and tongues are capable of curlng. An essential-for-life code contained within the spiraling double-helix structure of DNA (deoxyribonucleic acid) found in the nucleus of every cell.
Long strands of alterna...
Published on September 23, 2013 04:00