Dr. David A. Wolf MD Chief NASA Astronaut , https://www.jsc.nasa.gov/Bios/htmlbios/wolf.html%20
Stem Cell News
The recently completed Human Genome Project, determined the sequence of DNA in the human genome (each species has its own), lists about 25,000 genes. Added together the human genome contains over 3 billion chemical letters. If all the letters in the genome of a single stem cell were put on paper, the amount of information would fill one and a half million pages.
The interplay between genes and proteins lies behind many, if not most, illnesses. Thousands of disorders, such as cystic fibrosis, sickle cell anemia, and Huntington’s disease, result from a single defective or mutated gene, making a dysfunctional protein.