ACKNOWLEDGEMENTS
The author would like to thank his former colleagues in process development, manufacturing and research at Amgen for explaining
their needs to him and enriching his understanding of bioprocesses through many years of collaboration.
Zhiwu (David) Fang is the founder and principal consultant of Systems Quality-by-Design, Inc., Newbury Park, CA, 626.716.2016, zfang@systemsqbd.com
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