Once reconstituted in sterile bacteriostatic water or physiological saline, the compound remains active for approximately 24 weeks under refrigeration at 4C, provided repeated freeze-thaw cycles are avoided
Martyn KD, Frederick LM, von Loehneysen K, Dinauer MC, Knaus UG
For brand-name pens: Manufacturer expiration dates allow longer storage, typically 18 to 24 months from manufacturing
Cheng L, Ma F (2004) Diurnal operation of the xanthophyll cycle and the antioxidant system in apple peel
Prothrombin time (PT) measures the activity of fibrinogen (factor I), prothrombin (factor II), and factors V, VII, and X
This distinction is everything when it comes to designing a research protocol