Table 1.

The primer sequences for qRT-PCR assay in this study.

Gene	Sequence
	Forward (5′-3′)	Reverse (5′-3′)
circ_0013958	5′-TTCAACCCACAGGAGGTCTT-3′	5′-ATAGCTGGGGGTTCCACTCT-3′
miR-637	5′-ACTGGGGGCTTTCGGGCT-3′	5′-GAACATGTCTGCGTATCTC-3′
PLXNB2	5′-CTTCAGCCTGATCCAGAGGTTTG-3′	5′-GTGGAACACGTAGTCTGTACCC-3′
GAPDH	5′-TGTTCGTCATGGGTGTGAAC-3′	5′- ATGGCATGGACTGTGGTCAT-3′
U6	5′-CTCGCTTCGGCAGCACA-3′	5′-AACGCTTCACGAATTTGCGT-3′