More on genes but the best is to come

https://www.nap.edu/read/23405/chapter/3

http://www.businessinsider.com/scientists-edit-dna-human-embryos-crispr-first-2017-7?IR=T

https://www.nature.com/articles/ncomms15842

https://www.newscientist.com/article/2137926-dna-variants-that-are-bad-for-health-may-also-make-you-stupid/