There was an error in Development (2019) 146, dev178871 (doi:10.1242/dev.178871).

In the Materials and Methods section, the concentration of rapamycin used was incorrect.

Corrected: mTOR was blocked with a bath solution containing 10 µM rapamycin (Sigma-Aldrich) diluted in rearing media for up to 48 h.

Original: mTOR was blocked with a bath solution containing 10 mM rapamycin (Sigma-Aldrich) diluted in rearing media for up to 48 h.

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

The authors apologise to readers for this error and any inconvenience it may have caused.