Like ephelides, their onset is during childhood and they are distributed in large numbers (sometimes coalescing) in sun-exposed areas of the face, neck, shoulders, arms, and dorsal hands (Figure 7-4)
Moreover, there is significant granularity within bias, as a G protein-biased ligand may selectively activate some G proteins and not others, and a -arrestin-biased ligand may selectively activate some arrestin functions, such as internalization or signaling, and not others, such as desensitization [8991]
It is highly concentrated in muscle and brain tissues
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