Accelerating Antibody Screening with a Scalable Protein Expression Platform

January 30, 2026

Diane Retallack, President & COO, Primrose Bio at PepTalk: The Protein Science and Production Week at San Diego, CA

P. fluorescens-based Pfenex Expression Technology® transforms protein production through combinatorial screening to identify robust strains. With more than 20 years of development and 6 marketed products, Pfenex excels where others fail. Launched in 2024, Pfast™ offers an affordable 10 day evaluation of protein titer and quality. Tested on more than 30 partner proteins, Pfast significantly improved productivity challenges, improving pipeline management with seamless integration.

Diane Retallack

Diane Retallack, PhD was a founding member of the team that established the Pfenex Expression Technology® platform, overseeing strain engineering, HTP screening, and upstream development. With over 25 years of experience in molecular biology, protein expression, and executive management, she has contributed to multiple therapeutic programs from product conception through commercialization. Diane completed her doctorate at the University of Michigan and post-doctoral work at the University of Wisconsin-Madison.

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