Mylc cells are immature myeloid cells that have been further immortalized after differentiation of human iPS cells and can be induced to differentiate into dendritic cells. Mylc cells are immature myeloid cells that have been immortalized after induction of differentiation from human iPS cells, and can be induced to differentiate into dendritic cells. The immune response that has been confirmed in Euglena-derived substances has been reproduced in experiments using Mylc cells.