This ELISA kit enables sensitive, quantitative detection of C‑C Motif Chemokine as a CHO‑derived host cell protein impurity. Designed for bioprocess development and purification monitoring, the assay provides high specificity and a broad dynamic range suitable for culture supernatants, in‑process samples, and purified biologics. The pre‑coated microplate and optimized reagents deliver consistent, reproducible performance across runs, supporting regulatory‑aligned impurity profiling. E‑65CC2 is well suited for characterization of CHO process‑related proteins involved in immune signaling, ensuring robust monitoring of low‑abundance chemokine contaminants in biologics manufacturing.