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They settled on an mRNA called RUNX1-Trap, which keeps RUNX1 in a cell's cytoplasm, preventing it from entering the nucleus and turning on the gene that turns the cells into scar tissue.

On the one hand, enough copper ions must be on hand; on the other, the concentration of free copper ions in the cytoplasm must be kept very low to avoid undesired side effects.

However, it localized in the cytoplasm in granular form in the macrophages and differentiated into osteoclasts, distinct from its normal peri-nuclear localization in other cell types, indicating its cytoplasmic function in osteoclast differentiation.

It's a quirk of biology that even healthy cells routinely decorate their outer membranes with small chunks of the proteins they have bobbing in their cytoplasm -- an outward display that reflects their inner style.

These ions are exceedingly rare within the cytoplasm but abundant in proteins where they often form part of the architecture and catalyze chemical reactions.