The Robins sequence referred to seems to relate to an underdevelopment of the chin. Here they see it linked with ABO group AB in males.
Actually, in looking at embryology, I had wondered if the behavior of the fetus plays a part in issues of chin development as the extension of the cervical spine region plays a role in how the chin forms and separates from the sternum. Of course this also relates to the formation of the rib cage, heart and lungs to some extent. Here's the point, can we see that those with large chins and mouth cavities are more likely to have chest deficits. Behavior wise, those with large chins are more upward looking and exploring, more expansive? Yes, I am saying that those with larger lower face regions are more likely types N.
Disclaimer: the above is vagrant thinking about things where need to know is high and data is low. Just wondering
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