Correction to: Nature Biomedical Engineering, published online 2 April 2018.

In the version of this Article originally published, in Fig. 3b, middle row, the units ‘nM’ were incorrect and should have been ‘min’. And, in Fig. 4f, in the bottom row, the data in the middle and right panels were mistakenly duplicated from the panels above; the original and corrected panels are shown below. These errors have now been corrected.

Fig. 4f: Original and corrected.
figure 2

The corrected version includes the correct middle and right panels in the bottom row.