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anyone with copper-metabolism disorders (e.g., Wilsons disease) is exactly the population that should avoid copper-peptide exposure in any research context

Subcutaneous: These injections are less common

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Trends in Biochemical Sciences

This range is comfortable for subcutaneous injection, and the volume is large enough that small measurement errors don't create significant dose variability

Furthermore, individual LTL is apparently a very dynamic parameter reflecting changes which are often transient (e.g., following induction of immune responses) and have nothing to do with aging process per se