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Residues interact with the conserved calcium ion in each NA subtype.
| NA Subtype | Residues Interact with the Calcium Ion |
|---|---|
| N1 | D293, G297, D324, G345, Y347 |
| N2 | D293, G297, D324, G345, Q347 |
| N3 | D293, G297, D324, G345, P347 |
| N4 | G297, D324, G345, R346, Y347 |
| N5 | D293, G297, D324, Y347 |
| N6 | D293, G297, D324, P347 |
| N7 | D293, G297, D324, P347 |
| N8 | D293, G297, D324, Y347 |
| N9 | D293, G297, D324, N347 |
Residues in bold font are 340-loop residues.
