Correction: Divalent cation and chloride ion sites of chicken acid sensing ion channel 1a elucidated by x-ray crystallography.

[This corrects the article DOI: 10.1371/journal.pone.0202134.].

The following information is missing from the Funding section: The NE-CAT beamlines are funded by the NIH (NIGMS grant P41 GM103403 and NIH-ORIP HEI grant S10 RR029205), and used resources of the Advanced Photon Source at Argonne National Laboratory under DOE Contract No. DE-AC02-06CH11357.