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Mobile phase A was H 2 O + 0.5% AA

store in sealed containers with additional desiccant if needed Stability data: 12+ months at -20C, 24+ months at -80C for optimal activity retention Record storage date, conditions, and any temperature excursions in laboratory records pH and Buffer Considerations: Both peptides stable at physiological pH (7.0-7.4) Phosphate buffered saline (PBS, pH 7.4) suitable for most applications HEPES buffer (10-25 mM, pH 7.2-7.4) alternative for CO-independent systems Avoid extreme pH (9.0) which may cause degradation or aggregation For long-term storage, slightly acidic pH (6.0-6.5) may enhance stability for some peptides Stability Considerations: Both peptides carry modifications that improve protease stability (semaglutide via a DPP-4-resistant Aib8 substitution

Cloning and expression of the chicken type 2 iodothyronine 5-deiodinase