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categories: ["reproduction", "genetics"]categories: ["reproduction", "genetics"]tags: ["embryo models", "stem cells", "developmental biology", "14-day rule", "bioethics", "regulation"]tags: ["embryo models", "stem cells", "developmental biology", "14-day rule", "bioethics", "regulation"]summary: "Structures grown by aggregating stem cells that reproduce stages of early embryonic development without fertilisation, and the regulatory categories they fall outside."summary: "Structures grown by aggregating stem cells that reproduce stages of early embryonic development without fertilisation, and the regulatory categories they fall outside."updated: "2026-07-27"updated: "2026-08-23"humanEvidence: "Nothing has been done in a person. Human work is confined to cultured cells, and no embryo model in any species has produced a live animal after transfer to a uterus."humanEvidence: "Nothing has been done in a person. Human work is confined to cultured cells, and no embryo model in any species has produced a live animal after transfer to a uterus."access: "Not a product and not for sale: the models are made in research laboratories from pluripotent stem cell lines, and none is offered clinically or reproductively."access: "Not a product and not for sale: the models are made in research laboratories from pluripotent stem cell lines, and none is offered clinically or reproductively."reversibility: "context"issues: ["The 2023 human integrated embryo model reports are described without citations.", "The 2016 thirteen-day human embryo culture result needs a citation."]issues: ["The 2023 human integrated embryo model reports are described without citations.", "The 2016 thirteen-day human embryo culture result needs a citation."]------ removed, struck through added, underlinedLine numbers count the serialised markdown of each revision, frontmatter included.
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