Somebody told me that you might have reptilian DNA if:
-you are Rh(-)
-have a specific hairline, so called "widow's peak"
-have unusually low blood pressure and heart rate
-are attracted to rituals, hierarchy, symbolism ( although I read that if you are a bit reptilian you would rather avoid any type of ritual as it could activate that reptilian part in you and such people might be sought by reptilian entities)
- have good night vision