This affinity‑purified chicken antibody targets hamster (CHO) Annexin A5, a calcium‑dependent phospholipid‑binding protein associated with membrane dynamics, apoptosis signaling, and cellular stress responses. Designed for high‑specificity detection in CHO‑based systems, it performs reliably in ELISA, Western blotting, and impurity profiling workflows. The avian origin reduces interference from mammalian immunoglobulins, supporting low‑background, high‑signal assays even in complex matrices. Its rigorous purification ensures strong affinity and reproducible performance, making it a valuable reagent for bioprocess development, HCP monitoring, and analytical characterization of CHO‑derived proteins involved in membrane stability and cell viability.