The next is probably NPA system of genes
At some point lower is ABO gene, but perhaps the ABO gene is simply in linkage with one of the NPA genes (like DBH).
Ethnicity may be at a lower level as well?
Then at some lower levels can be included genes that are linked with some other personality systems (OCEAN or the Big Five traits is a commonly discussed system for example, the CLoninger traits (reward dependence, novelty-seeking, etc.)
The ABO gene in our office patients seems to show itself by a lower stress level (lower S scores) in those with A or B phenotypes. This is backed up by just a general demeanor and facial expression of lower stressful look to those with A or B. If one has time to focus on it, one can make a decent guess of ABO type even in celebrities especially politicians by looking at this. Trump seems to have inherited the A gene from his German father.
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