A Complete Response Letter (CRL) from the FDA, essentially a request for more information or additional studies, would add at least 12 months to the timeline
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J Biol Chem 282:1842736 Pineda-Molina E, Klatt P, Vazquez J, Marina A, Garcia DL (2001) Glutathionylation of the p50 subunit of NF-kappaB: a mechanism for redox-induced inhibition of DNA binding
Some researchers also note the concentration in mcg per unit: at 10mg/mL, each unit on a U-100 syringe contains 100mcg (since 10,000mcg per 100 units = 100mcg per unit)