In the second phase of human experiments, we found that the mortality caused by its protective treatment was higher than that of the control group (Narayan et al., 2002)
Researchers compared outcomes in patients taking GLP-1 receptor agonists against those taking older diabetes medications known as DPP-4 receptor agonists
They share an immune regulatory network, and dysfunction in one affects the other
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A couple of papers published in Italian and German between 1970 and 1972 are the closest I could find, but I could not access them online