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Expression levels of lncRNA H19 in serum exosomes. Exosomal lncRNA H19 levels were significantly higher in patients with gastric cancer before surgery (Pre-operation) compared with levels in healthy volunteers (Control) (a) and in patients after tumour resection (Post-operation) (b). *P < 0.01 by unpaired t-test, **P < 0.01 by paired t-test.
