Abstract: A novel human stem cell which can be differentiated to cells constituting a plurality of human organs including human liver is disclosed. The human stem cell according to the present invention is originated from human salivary gland, which is CD49f-positive, and which can be differentiated to (1) a nestin-positive and albumin-positive cell, (2) an insulin-positive cell and (3) a glucagon-positive cell by culture in vitro.

Abstract: A transgenic animal having diabetes, which is more suitable as a model of human than rodents, and its preparation method are disclosed. The method for preparing the transgenic pig comprises introducing a nucleic acid into a fertilized egg, clonal egg or embryo, the nucleic acid comprising a foreign gene which contains a region encoding dimerization domain of hepatocyte nuclear factor-1?, but does not encode a normal hepatocyte nuclear factor-1?, and a promoter located upstream of the foreign gene, which promoter is capable of expressing the foreign gene in a pig cell; and developing an individual from the fertilized egg, clonal egg or embryo.

Abstract: A novel human stem cell which can be differentiated to cells constituting a plurality of human organs including human liver is disclosed. The human stem cell according to the present invention is originated from human salivary gland, which is CD49f-positive, and which can be differentiated to (1) a nestin-positive and albumin-positive cell, (2) an insulin-positive cell and (3) a glucagon-positive cell by culture in vitro.