--- title: Growth and Site to Site Comparison of a HEK Fed-Batch Process in Stratyx™ 250 description: Reproducibility across labs is critical for adopting new bioprocessing technologies. In this white paper, we present results from a multi-site evaluation of the Stratyx™ 250 bioreactor platform, testing its consistency across three independent locations—including two non-Culture Biosciences labs. Using a fed-batch HEK cell process known for its sensitivity to variation, we assessed performance across different operators, equipment, and SOPs. Key metrics like viable cell density, viability, and lactate production showed consistent results across all sites. 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In this white paper, we present results from a multi-site evaluation of the Stratyx™ 250 bioreactor platform, testing its consistency across three independent locations—including two non-Culture Biosciences labs. Using a fed-batch HEK cell process known for its sensitivity to variation, we assessed performance across different operators, equipment, and SOPs. Key metrics like viable cell density, viability, and lactate production showed consistent results across all sites. Download the white paper to see how the Stratyx 250 delivers reliable, reproducible performance wherever it's used. ## Complete the form to download the full PDF ## Keep exploring [See all](https://www.culturebiosciences.com/resources) [![High-Density TFF Perfusion on the Stratyx 250 Platform](https://www.culturebiosciences.com/hs-fs/hubfs/Perfusion-Featured-Image-1.png?width=500&height=500&name=Perfusion-Featured-Image-1.png) White Paper High-Density TFF Perfusion on the Stratyx 250 Platform July 20, 2026](https://www.culturebiosciences.com/resources/high-density-tff-perfusion-on-the-stratyx-250-platform) [![Real-Time Closed-Loop Optimization Delivers 43% Titer Improvement](https://www.culturebiosciences.com/hs-fs/hubfs/Ark-TB-Thumbnail.png?width=500&height=500&name=Ark-TB-Thumbnail.png) White Paper Real-Time Closed-Loop Optimization Delivers 43% Titer Improvement May 5, 2026](https://www.culturebiosciences.com/resources/real-time-closed-loop-optimization-delivers-43-titer-improvement) [![STRATYX™ Delivers Superior Viable Cell Density and Increased mAb Titer Compared with Conventional 250 mL Bioreactors in Fed-Batch CHO Culture.](https://www.culturebiosciences.com/hs-fs/hubfs/Bionova-Thumbnail.png?width=500&height=500&name=Bionova-Thumbnail.png) White Paper STRATYX™ Delivers Superior Viable Cell Density and Increased mAb Titer Compared with Conventional 250 mL Bioreactors in Fed-Batch CHO Culture. 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