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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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    $\begingroup$ Hi and welcome. Your question is very interesting, however, the general expectation of SE is that you demonstrate that you have researched the topic of your question and have hit a wall in that search, or you are looking for expert advice to explain an advanced topic that you have found that you are having a difficult time explaining. Review How Do I Ask a Good Question for tips and general expectations for the site. Though I personally hope someone can provide an answer as I would be interested in this as well. $\endgroup$
    – AMR
    Sep 15 '15 at 13:11
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    $\begingroup$ Possible duplicate of biology.stackexchange.com/q/31920/3340 $\endgroup$
    – WYSIWYG
    Sep 15 '15 at 13:15
  • $\begingroup$ yep, sorry for duplicating and thanks for your answers! $\endgroup$
    – dshulgin
    Sep 16 '15 at 8:58