Story perspectives

R3 Bio Develops Ethical 'Organ Sacks' to Replace Animal Testing

3/23/2026

Summary

Story summary

R3 Bio is developing 'organ sacks,' engineered organ systems without brains, to replace animal testing in drug development.
Alice Gilman, co-founder of R3 Bio, envisions creating human versions of these organ systems for tissue and organ sourcing.
The startup's strategy aligns with the phasing out of animal experimentation by the Trump administration.
Currently, R3 plans to create monkey organ sacks, offering a more ethical and scalable testing model.

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Story summary

R3 Bio is developing 'organ sacks,' engineered organ systems without brains, to replace animal testing in drug development.
Alice Gilman, co-founder of R3 Bio, envisions creating human versions of these organ systems for tissue and organ sourcing.
The startup's strategy aligns with the phasing out of animal experimentation by the Trump administration.
Currently, R3 plans to create monkey organ sacks, offering a more ethical and scalable testing model.