View all text of Subpart W [§ 174.500 - § 174.545]
§ 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.