Figure 4. Astrocyte basal Ca²⁺ levels are developmentally regulated.

(A) Characteristic Ca²⁺ concentration map in a gap junction-coupled astrocyte from a mouse aged 15 days. Note that the Ca²⁺ concentration increases towards the branches. (B) Distribution of resting Ca²⁺ in cellular compartments of gap junction-coupled astrocytes from images such as those in A. Two developmental ages are shown. The image is reproduced (with permission) from Figure 5 of a recent paper [82].