# 9 CFR § 101.7: Seed organisms

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-9-101.7

## Section

- **Citation:** 9 CFR § 101.7
- **Heading:** Seed organisms
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 9—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 > PART 101—DEFINITIONS

## Text

When used in conjunction with or in reference to seed organisms, the following shall mean:
(a) Master Seed. An organism at a specific passage level which has been selected and permanently stored by the producer from which all other seed passages are derived within permitted levels.
(b) Working Seed. An organism at a passage level between Master Seed and Production Seed.
(c) Production Seed. An organism at a specified passage level which is used without further propagation for initiating preparation of a fraction.
[49 FR 22625, May 31, 1984]

## Nearby sections

- [9 CFR § 101.1 § 101.1 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.1.md)
- [9 CFR § 101.2 § 101.2 Administrative terminology.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.2.md)
- [9 CFR § 101.3 § 101.3 Biological products and related terms.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.3.md)
- [9 CFR § 101.4 § 101.4 Labeling terminology.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.4.md)
- [9 CFR § 101.5 § 101.5 Testing terminology.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.5.md)
- [9 CFR § 101.6 § 101.6 Cell cultures.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.6.md)
- [9 CFR § 101.7 § 101.7 Seed organisms.](https://www.frixlaw.com/law-library/statutes/ecfr-9-101.7.md)
- [9 CFR § 102.1 § 102.1 Licenses issued by the Administrator.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.1.md)
- [9 CFR § 102.2 § 102.2 Licenses required.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.2.md)
- [9 CFR § 102.3 § 102.3 License applications.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.3.md)
- [9 CFR § 102.4 § 102.4 U.S. Veterinary Biologics Establishment License.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.4.md)
- [9 CFR § 102.5 § 102.5 U.S. Veterinary Biological Product License.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.5.md)
- [9 CFR § 102.6 § 102.6 Conditional licenses.](https://www.frixlaw.com/law-library/statutes/ecfr-9-102.6.md)
- [9 CFR § 103.1 § 103.1 Preparation of experimental biological products.](https://www.frixlaw.com/law-library/statutes/ecfr-9-103.1.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-9-101.7. Check the current official text before relying on it. Not legal advice.