Cheese ripening the cheese by fungi to occur. Mould-ripened cheeses ripen faster than hard cheeses, in weeks as opposed to the typical months or even years. This is because the fungi used are more biochemically active than the starter bacteria. Where the ripening occurs is largely dependent on the type of cheese: some cheeses are surface-ripened by moulds, such as Camembert and Brie; and some are ripened internally, such as Stilton. Surface ripening of some cheeses, such as Saint-Nectaire cheese, may also be influenced by yeasts which contribute flavour and coat texture. Others are allowed by the cheesemaker to develop bacterial surface
Cheeses of Mexico and camembert are also made. The state of Guanajuato is known for its reproduction of European cheeses, especially those from France. In Chiapas, personnel from the Universidad Autónoma de Chiapas have been investigating a Spanish cheese called "la Serena", which is made in the region of Extremadura with the aim of creating a certified version of it in Mexico. This includes the importation and raising of Merino sheep, as well as learning the methods behind this cheese. The reason behind the effort is that large parts of the state have a similar climate to Extremadura, making the raising of this