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. 2018 Dec 4;9:1737. doi: 10.3389/fphys.2018.01737

FIGURE 1.

FIGURE 1

Schematic representation of LTCC subgroups A–F. LTCCs are located either in the T-tubular membrane (subgroups A–C) or in the bulk of the sarcolemma (subgroups D–F). LTCCs were either associated with both β2ARs and PDEs (subgroups A, D), solely with β2ARs (subgroups B, E), or not associated with β2ARs at all (subgroups C, F). The channels were either phosphorylated (red) or unphosphorylated (green).