There were errors published in Development (2018) 145, dev147157 (doi:10.1242/dev.147157).

In the Materials and Methods section, catalogue numbers for anti-pSMAD1/5/8 and anti-Ki67 antibodies were listed incorrectly.

Corrected:

Mouse forebrain sections of the desired stage were subjected to immunohistochemistry using the following primary antibodies: antipSMAD1/5/8 (1:100; 9511, Cell Signaling Technology), anti-Tbr1 (1:2000; Ab31940, Abcam), anti-Tbr2 (1:1000; Ab15894, Abcam), antiCtip2 (1:300; Ab28448, Abcam), anti-Brn2 (1:4000; SC6029, Santa Cruz Biotechnology), anti p-Cofilin (1:300; SC21867R, Santa Cruz Biotechnology), anti-GM130 (1:300; 610822, BD Biosciences), anti-GFP (1:500; A-6455, ThermoFisher Scientific) and anti-Ki67 (1:500; Ab9260, Abcam).

Original:

Mouse forebrain sections of the desired stage were subjected to immunohistochemistry using the following primary antibodies: antipSMAD1/5/8 (1:100; 8828, Cell Signaling Technology), anti-Tbr1 (1:2000; Ab31940, Abcam), anti-Tbr2 (1:1000; Ab15894, Abcam), antiCtip2 (1:300; Ab28448, Abcam), anti-Brn2 (1:4000; SC6029, Santa Cruz Biotechnology), anti p-Cofilin (1:300; SC21867R, Santa Cruz Biotechnology), anti-GM130 (1:300; 610822, BD Biosciences), anti-GFP (1:500; A-6455, ThermoFisher Scientific) and anti-Ki67 (1:500; Ab39260, Abcam).

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.