part_of part of part of bearer_of has characteristic derives_from embryonic stem cell Mus musculus normal embryo normal cell line ESC derived cell line ES-E14TG2a ATCC:CRL-1821 http://www.lgcstandards-atcc.org/products/all/CRL-1821.aspx Laura Huerta This is a derivative of one of several mouse embryonal stem cell (ES) lines developed by M. Hooper in 1987.