There were errors in Development (2019) 146, dev175729 (doi:10.1242/dev.175729).

In the Materials and Methods section, the service providers for in vitro Cas9 assay and Illumina Sequencing systems were not mentioned.

Corrected:

To verify that miR-19b guide RNA expressed using pX330-19b-gRNA construct can knock out the miR-19b genomic locus, an in vitro Cas9 assay was performed [Centre for Cellular and Molecular Platforms (C-CAMP), Bangalore, India].

Original:

To verify that miR-19b guide RNA expressed using pX330-19b-gRNA construct can knock out the miR-19b genomic locus, an in vitro Cas9 assay was performed.

Corrected:

The mixed pool of 508 bp DNA fragments obtained was analysed by Illumina Sequencing systems (Clevergene Biocorp).

Original:

The mixed pool of 508 bp DNA fragments obtained was analysed by Illumina Sequencing systems.

Both the online full-text and PDF versions have been updated.

The authors apologise to readers for these errors and any inconvenience they may have caused.