What are the popular theories regarding how our blood divided into 4 groups. Particularly I'm interested in whether this was originally linked to disease.
Thanks for your answers, useful articles and further reading would also appreciated.
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Sign up to join this communityWhat are the popular theories regarding how our blood divided into 4 groups. Particularly I'm interested in whether this was originally linked to disease.
Thanks for your answers, useful articles and further reading would also appreciated.