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Figure 3 Gel electrophoresis of two samples from patients with calcified aortic valve disease (Cases 13 and 19) after reverse transcription (RT)-polymerase chain reaction. Both glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and heat shock protein-60 (hsp60) indicate their respective amplification products. In the "No RT" lane, retrotranscription after the DNase treatment of the samples was omitted.