Abstract: The object of the present invention is to provide a method for preparing induced pluripotent stem cells from MAIT cells, and providing induced pluripotent stem cells derived from MAIT cells. Another object of the present invention is to provide a method for preparing MAIT-like cells from induced pluripotent stem cells, and providing MAIT-like cells. Differentiation of the induced pluripotent stem cells having a MAIT cell-specific TCR gene can be induced to establish MAIT-like cells.

Abstract: A system comprising a database for registering parts environment information in advance; search means for searching the database for a part constituting a product; calculation means for calculating an environment information evaluation value of the part by using environment information in the database if one is found as a result of the search, or by averaging environment information of a part of the same type or the same material as the search target part registered in the database if environment information of the search target part is not registered in the database; and output means for outputting an environment information evaluation value calculated for the product.