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They are simply not the same kind of thing

Conclusion: Black or tarry stools do not always suggest a serious condition
This system is responsible for vital functions that occur beyond our conscious awareness: breathing, heart rate, temperature control

Neurochemical Journal

Other culprits include a genetic condition called familial hypercalcemia (aka blue diaper syndrome), and an atypical urine infection from pseudomonas bacteria
References Brown KL
