StacksVerified U.S. regulatory reference

9 CFR §101.7

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
When used in conjunction with or in reference to seed organisms, the following shall mean:
  1. (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.
  2. (b)Working Seed. An organism at a passage level between Master Seed and Production Seed.
  3. (c)Production Seed. An organism at a specified passage level which is used without further propagation for initiating preparation of a fraction.