Spermine and spermidine were purchased from Sigma Aldrich, Darmstadt, Germany (#S3256 and #S2626). Aminoguanidine was obtained from Sigma Aldrich (#109266). The Xvivo-15 growth medium was purchased from Biozym, Hessisch Oldendorf, Germany (#BE02-060F). The DMEM and PRMI 1640 growth mediums were purchased from Life Technologies, Carlsbad, CA, USA (#41965-039 and ##21875-034). Fetal calf serum war purchased from Invitrogen, Waltham, MA, USA (#10270106).
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