Durif 4.91 as approved grape varieties for American wines, but they are not listed as synonyms. This means that U.S. producers can produce Durif wine, but not label it as Petite Sirah, and vice versa. The ATF proposed that they be recognised as synonyms in "Notice of Proposed Rulemaking No. 941", published in the Federal Register on 10 April 2002, but a decision on RIN 1513–AA32 (formerly RIN 1512-AC65) appears to be postponed indefinitely, probably because the new regulation is tied up in the trade dispute that would see the TTB recognise Primitivo as a synonym for Zinfandel. While not one
Petite mutation petite negative mutants. Potentially, these yeasts have a different inheritance system in place for their mitchondrial genome than "S. cerevisiae" does. The frequency at which "S. castellii" spontaneously produces petites is similar to that of "S. cerevisiae", with the mitochondrial DNA of those petites being highly altered via deletion and rearrangement. Suppressive petites of "S. cerevisiae" are the most commonly observed spontaneously created mutants, whereas in "S. castellii," the most commonly observed spontaneous mutant is the neutral petite, further leading to speculation that the transference of this mutation differs between species. Petite mutation petite (ρ–) is a mutant first discovered