Table 1. Frequency of the contacts between the sodium ion and the receptor coordinating atoms.

Atom	CXCR4	CCR5
D2.50:OD1	0.99 ± 0.01	0.59± 0.24
D2.50:OD2	0.01 ± 0.01	0.41 ± 0.12
N3.35:OD1/G3.35:O	0.98 ± 0.02	< 0.1
S3.39:OG/S2.49:OG	0.99 ± 0.01	<0.1
H7.45:NE2	0.99 ± 0.01	0.68 ± 0.20
N7.49:OD1	0	0.17 ± 0.13

The data represent the frequency of frames with the sodium ion within contact distance of the receptor coordinating atoms (threshold of 3 Å). Data reported are the average ± standard deviations of the CXCR4 and CCR5 replicates.