9 C.F.R. § 101.7 Seed organisms.
Title 9 - Animals and Animal Products
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]
Title 9: Animals and Animal Products
PART 101—DEFINITIONS
§ 101.7 Seed organisms.
