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Electrochemical genosensing of GAPDH transcripts from (A) MCF7 cells ranging from 50 to 5000 cells mL–1 and (B) their exosomes ranging from 100 to 4.0 × 104 exosomes μL–1, according to NTA counting. In all cases, the cells and exosomes were lysed preconcentrated by IMS using antiCD81-MPs (▲) and antiCD326-MPs (●), followed by double-tagging RT-PCR on poly(dT)-MPs. The error bars show the standard deviation for n = 3.
