Touraine AOC and from Sauvignon blanc and Arbois grapes. The white Touraine wines are dry, fairly firm, lively and full, and keep well when bottled. The sparkling wines are allowed to use the designation "Touraine mousse" (sparkling Touraine wine). Up to 20% of Chardonnay grapes may be included in the mixture of varieties grown. The red wines are produced from Cabernet Franc, Cabernet Sauvignon, Côt, Pinot noir, Pinot Meunier, Pinot gris, Pineau d'Aunis and Gamay grape varieties (Gamay is used only for wines marketed in the first year after production). These wines are flavoursome and tannic in character. Touraine wines sold in
Petite mutation be induced using a variety of mutagens, including DNA intercalating agents, as well as chemicals that can interfere with DNA synthesis in growing cells. Mutagens that create Petites are implicated in increased rates of degenerative diseases and in the aging process. A mutation that produces small (petite" > petite) anaerobic-like colonies had shown first in Yeast Saccharomyces cerevisiae and described by Boris Ephrussi and his co-workers in 1949 in Gif-sur-Yvette, France. The cells of petite colonies were smaller than those of wild-type colonies, but the term “petite” refers only to colony size and not the individual cell size. Over 50