Fig. 3.
(A) Appearance of a tumor cell colony grown for 20 days in methylcellulose in LTBMC medium supplemented with EGF and IGF (original magnification, ×100). (B) Immunofluorescence staining of cells picked from tumor cell colonies shown in (A) after staining with FITC-labeled anticytokeratin antibodies (original magnification, ×40).