"a genetic marker could be a group such as a race, or people with brown eyes…."
"We also know that DNA sequencing research can be used to develop pathogens that target specific genetically related groups"
Quotes are from pg 519.
Biological Warfare on pg 505 (pg 59 of 230 in pdf)
https://www.cia.gov/library/abbottabad-compound/2D/2DE334239CCF768F6A9E0CFD1974455D_Crossing_The_Rubicon_Part_2.pdf