| In general, manganese ions are found in different valence states from divalent to septavalent. |
| Precipitation of NCP occurs for a threshold of divalent cation concentration, and redissolution is observed for further addition of salt. |
| When the divalent cation dissociates from actin, the affinity of actin for nucleotide is greatly reduced. |
| In an alternative model, two pairs of the negatively charged residues would chelate two divalent cations. |
| Thus, the competition between monovalent and divalent cations acts only on the DNA sites and does not act on the mica sites. |
| These channels appear to be plasma membrane-located and non-selective, being permeable to both monovalent and divalent cations. |
