40 CFR 174.526 - Hygromycin B phosphotransferase (APH4) marker protein in all plants; exemption from the requirement of a tolerance.

Regulations last checked for updates: Feb 16, 2025

Title 40 - Protection of Environment last revised: Nov 16, 2025

View all text of Subpart W [§ 174.500 - § 174.552]

§ 174.526 - Hygromycin B phosphotransferase (APH4) marker protein in all plants; exemption from the requirement of a tolerance.

Residues of the Hygromycin B phosphotransferase (APH4) enzyme in all plants are exempt from the requirement of a tolerance when used as a plant-incorporated protectant inert ingredient in cotton.

[72 FR 20435, Apr. 25, 2007]

authority: 7 U.S.C. 136-136y; 21 U.S.C. 321(q), 346a and 371

source: 66 FR 37814, July 19, 2001, unless otherwise noted.

cite as: 40 CFR 174.526