There were two errors published in Development140, 667-674.

The insulin value for WM1 was incorrectly stated in the text on p. 671. The true value is 6.2 μg/ml, not 3.1 μg/ml as stated in the text, and the insulin concentration in supplementary material Table S1 should read 0.005 mg/ml.

The authors apologise to the readers for these errors.