the metastasizing rat mammary cell strain from the ludwig institute for cancer research ( london branch ) which was originally developed from a benign rat mammary tumor induced by n-methyl-n-nitrosourea ( cas : 684-93-5 ) , yielded single-cell-cloned lines of isometric epithelial cells [ rat mammary ( rama ) 600-rama 621 ] and one line of elongated cells ( rama 622 ) ;
C0235922
benign
C0006141
rama