On p.1, the sentence should read ‘This causes amnion-chorion separation and results in three cavities at E7.5: the amniotic and ectoplacental cavities, and the de novo-derived exocoelomic (visceral yolk sac) cavity.’
Fig. 1 and its legend contained an error. The correct figure and legend are provided below.
The authors also received funds from the Onderzoeksraad KU Leuven (GOA/11/012).
We and the authors apologise to readers for these mistakes.