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Several fluorophores are used in skin visualization

2021 Aug;24:E649-60

The reasons cited by the FDA included concerns about immunogenicity, peptide impurity characterization challenges, and the lack of adequate safety data from human clinical trials

We also found that testosterone in children with obesity correlated positively with AUC 08:0016:00 and AUC 08:0023:00 , consistent with the phenomenon of co-activation, where cortisol and testosterone (and dehydroepiandrosterone) are positively linked within an individual [41]

It's likely to be accompanied by other neurological deficits though, and it's worth remembering that muscle stiffness and pain can be caused by many other things