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Comparison the expression of hsa_circ_0021087 and hsa_circ_0005051 in patients' plasma with gastric cancer before and after operation. (A) Downregulated hsa_circ_0021087 was detected at a higher level in plasma samples after surgical resection. (B) Hsa_circ_0005051 was detected at preoperative and postoperative stages with no significant differential expression. ****P < 0.0001.
