Cell. 2014 Nov 6;159(4):925-39. doi:10.1016/j.cell.2014.10.002

Green AA, Silver PA, Collins JJ, Yin P.

Toehold switches: de-novo-designed regulators of gene expression.

Toehold switches are similar to conventional riboregulators, except that they have less sequence constraints, allowing for larger-scale multiplexing.