Correction to: Nature Published online 6 September 2021

In the version of this article initially published, there were presentation errors in Figs. 1 and 3 and Extended Data Figs. 1 and 2. In Fig. 1c, an additional “U” was missing in the bottom sequence directly following “5′-”. In Fig. 3b, an additional point was missing above the error bar in the sixth (LwsCas13a; non-targeting 1) column and in Fig. 3b, additional points were missing above the sixth and eighth (LwsCas13a and PspCas13b; non-targeting 1) columns. In Extended Data Fig. 1b, the residue “2429” now shown at “Cas7 (domain 2)” appeared originally as “2426.” In Extended Data Fig. 2d, the cleavage site was presented one position higher than currently shown. The figures have been revised in the HTML and PDF versions of the article.