---
kind: "section"
citation: "40 C.F.R. § 174.537"
title: "40"
number: "174.537"
heading: "HPPD-4 protein; exemption from the requirement of a tolerance."
url: "https://uscodex.org/cfr/40/174.537"
---

# §174.537. HPPD-4 protein; exemption from the requirement of a tolerance.


Residues of the HPPD-4 protein, which is a modified protein derived from the 4-hydroxyphenylpyruvate dioxygenase enzyme of Pseudomonas fluorescens, in or on all food commodities are exempt from the requirement of a tolerance, when the HPPD-4 protein is used as a plant-incorporated protectant inert ingredient.


## Notes

### Amendments

[82 FR 57140, Dec. 4, 2017]

### Authority

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

### Source

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

### Amendments

[82 FR 57140, Dec. 4, 2017]