cel-mir-239b: Cel-mir-239b is a microRNA (miRNA) that is used as a negative control in various experiments. It has minimal sequence identity with miRNAs in human, mouse, and rat [PMC2699527]. In different studies, cel-mir-239b has been used as a control miRNA in experiments involving the inhibition of miRNAs function [PMC7253519]. It has been co-transfected with different vectors and synthetic miRNAs to assess the effects on gene expression [PMC7253519]. Cel-mir-239b has also been used as a negative control in studies involving the transfection of microRNA mimics and inhibitors [PMC7708977] [PMC9617134] [PMC4260481] [PMC4546478] [PMC3743786]. Additionally, cel-mir-239b has been employed as a negative control in experiments using siRNAs to minimize off-target effects and equalize the total amount of small RNA [PMC8019740] [PMC3572043]. It has also been used as a negative control in studies investigating microRNA expression and gene regulation using mimics or inhibitors of specific miRNAs [PMC6502783] [PMC4308918] [PMC5460990]  [ [ [ [ [ [ . In summary, cel-mir-239b is commonly used as a negative control in various experimental settings to assess the specific effects of other miRNAs or RNAi molecules.