I was able to find one potential B6 AML line using Taconic's syngeneic cell line database. I've placed links to the database and to the ATCC site for the AML cell line below.
Taconic Syngeneic Cell Line Database: http://bit.ly/2DRdqH1
Organism Mus musculus, mouse Cell Type lymphoblast Product Format frozen Morphology lymphoblast Culture Properties suspension Biosafety Level 1 Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country. Disease acute myeloid leukemia Gender female Strain C57BL/6J Applications Tested and found negative for ectromelia virus (mousepox). They are resistant to 0.1 mM cortisol. Storage Conditions liquid nitrogen vapor phase