Dataset S1 and Dataset S2 were erroneously omitted from the list of Supporting Information. Please view Dataset S1 here: http://www.plosbiology.org/corrections/pbio.1001105.s007.tif
and Dataset S2 here: http://www.plosbiology.org/corrections/pbio.1001105.s008.tif .
Footnotes
No competing interests declared.