This purified GTP‑binding nuclear protein RAN plays a central role in regulating nuclear–cytoplasmic transport of host cell proteins, influencing transcription, translation, and cell‑cycle progression. As a CHO‑reactive antigen, RAN supports ELISA and Western blot applications and provides a valuable tool for studying HCP trafficking, localization, and functional impact in bioprocessing environments. Its activity in GTP/GDP cycling makes it essential for understanding nuclear transport receptor loading and unloading, with downstream effects on gene expression and cellular integrity. This high‑quality recombinant RAN preparation offers consistent performance for assay development, impurity characterization, and mechanistic studies of CHO protein processing. Ideal for teams investigating HCP behavior, nuclear transport pathways, or cell‑health‑related impurities in biologics manufacturing.