Frequently Asked Questions Live Chat and Frequently Asked Questions are available for this Product. Caution Solutions should be sterile-filtered, not autoclaved, if sterile solution is necessary. Spermidine deaminates with time; solutions should be stored frozen. Prepare new solutions frequently. Other Notes In first strand cDNA synthesis1; Effect on endonuclease inhibition by agarose contaminants2 Biochem/physiol Actions Inhibits neuronal nitric oxide synthase (nNOS). Binds and precipitates DNA; may be used for purification of DNA binding proteins. Stimulates T4 polynucleotide kinase activity.