Here one is led to wonder if ABO B is associated with schizophrenia as well as with atopy. Atopy has been note to be associated with schizophrenia. And ABO B seems to have association with catecholamine genes that result in higher brain dopamine: norepinephrine ratio, a state that would predispose to schizophrenia.
At any rate, with the present state of knowledge limited, we can only wonder.
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