Brief comparison of miRNA detection strategies.

Strategies	Identification media	Sensitivity	Components	Ref.
The proposed method	HCR + CRISPR–Cas9	fM	Two probes
RACE	RCA + CRISPR–Cas9	fM	Padlock, primer	23
Triplex formation	Hairpin structure probes	nM	Two probes	24
Double molecular beacon	Hairpin structure probes	nM	One probe	25