There were errors published in Development 142, 858-870.

In the supplementary information, the sequences of four of the primers shown in Table S2 were incorrect. The correct sequences of these primers are as follows (5′-3′):

Hes1 mRNA reverse primer, gcgcggtatttccccaaca;

Onecut1 mRNA forward primer, agttccagcgcatgtcgg;

Onecut1 mRNA reverse primer, tttttgggggtgttgcctct;

Tcf7 mRNA reverse primer, agttcatagtacttggcctgctcttc.

The authors apologise to readers for these mistakes.