Note: it's a gene expression pattern. It's not like there's a monogamy gene that you have or don't have; rather there are genes that are more active in monogamo

Note: it's a gene expression pattern. It's not like there's a monogamy gene that you have or don't have; rather there are genes that are more active in monogamous species (or vice versa). So it won't show up on your 23andme test. It's a completely different type of analysis called RNA-seq, and in order to perform it they had to obtain actual brain tissue samples (not blood or saliva), because gene expression is different in every tissue.