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A simple two-pool exchange structure with tracee input into pool 1 alone but with removal from both pools. A bolus injection of tracer is made into pool 1, and the enrichment in pool 1 is observed. The activity model is unidentifiable, but the enrichment model is identifiable. Next to each arrow is a definition for the corresponding rate constant in the activity model (k’s) and in the enrichment model (r’s).
