The forces of interaction found for 5-day chick limb-bud cells in media containing different divalent ions (magnesium, calcium, strontium or barium) show that the cells are most adhesive in the presence of magnesium ions, then calcium and strontium, then barium. When magnesium and calcium ions are present together at similar concentrations the calcium ions modify the action of the magnesium ions. The importance of magnesium ions in cell adhesion is discussed.
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Janet E. Hornby (1973) studied this question.
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