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" ... Jacobson says, "What we've found is that the imbalance in the renin-angiotensin system (RAS) pathway that appeared to be present in Covid-19 patients could be responsible for constantly resensitizing bradykinin receptors. So, this imbalance in the RAS pathways will take the brakes off the bottom of the bradykinin pathway at the receptor level. In addition, the downregulation of the ACE gene in Covid-19 patients, which usually degrades bradykinin, is another key imbalance in the regulation of bradykinin levels. We have also observed that the key negative regulator at the top of the bradykinin pathway is dramatically down-regulated. Thus, you likely have an increase in bradykin production as well, stopping many of the braking mechanisms usually in place, so the bradykinin signal spirals out of control. " ... "