Frances Arnold explains how she harnesses the power of evolution to create proteins and organisms with applications in medicine and in alternative energy.

Building new biological objects

Welcome to Science Sessions, the PNAS podcast program. Listen to brief conversations with cutting-edge researchers, Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in PNAS, plus a broad range of scientific news about discoveries that affect the world around us.

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Building new biological objects

Building new biological objects

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