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We propose that the effects of cumulative loss of surface receptor with fast-internalizing, slow-recycling, lysosome-targeting agonists, along with increases in -arrestin-induced desensitization, become more apparent with time, eventually overriding any positive effects associated with noncanonical signaling
Yin J, Wei L, Wang N, Li X, Miao M
For researchers building a comprehensive IGF axis research workflow, the standard approach is to use IGF-1 LR3 as the primary tool for sustained IGF1R activation studies, native IGF-1 for short-pulse studies where IGFBP biology is itself the research question, and DES IGF-1 for the narrow set of experiments requiring receptor activation with rapid washout
So it looks like red and very dim light, dim red and bright red