---
kind: "unit"
title: "9"
title_heading: "Animals and Animal Products"
key: "chI/subchE/part121"
level: "part"
label: "Part 121"
heading: "Possession, Use, and Transfer of Select Agents and Toxins"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/9/chI-subchE-part121"
sections_count: 20
---

# Part 121 — Possession, Use, and Transfer of Select Agents and Toxins

Title 9 C.F.R. — Animals and Animal Products › Chapter I — Animal and Plant Health Inspection Service, Department of Agriculture › Subchapter E — Viruses, Serums, Toxins, and Analogous Products; Organisms and Vectors

## Sections

- [§121.1. Definitions.](/cfr/9/121.1.md)
- [§121.2. Purpose and scope.](/cfr/9/121.2.md)
- [§121.3. VS select agents and toxins.](/cfr/9/121.3.md)
- [§121.4. Overlap select agents and toxins.](/cfr/9/121.4.md)
- [§121.5. Exemptions for VS select agents and toxins.](/cfr/9/121.5.md)
- [§121.6. Exemptions for overlap select agents and toxins.](/cfr/9/121.6.md)
- [§121.7. Registration and related security risk assessments.](/cfr/9/121.7.md)
- [§121.8. Denial, revocation, or suspension of registration.](/cfr/9/121.8.md)
- [§121.9. Responsible official.](/cfr/9/121.9.md)
- [§121.10. Restricting access to select agents and toxins; security risk assessments.](/cfr/9/121.10.md)
- [§121.11. Security.](/cfr/9/121.11.md)
- [§121.12. Biosafety.](/cfr/9/121.12.md)
- [§121.13. Restricted experiments.](/cfr/9/121.13.md)
- [§121.14. Incident response. 12](/cfr/9/121.14.md)
- [§121.15. Training.](/cfr/9/121.15.md)
- [§121.16. Transfers.](/cfr/9/121.16.md)
- [§121.17. Records.](/cfr/9/121.17.md)
- [§121.18. Inspections.](/cfr/9/121.18.md)
- [§121.19. Notification of theft, loss, or release.](/cfr/9/121.19.md)
- [§121.20. Administrative review.](/cfr/9/121.20.md)