Figure 4: Representative images of sub-optimal plating density for reprogramming.
(A, B) Examples of fibroblasts that are too sparse by day 14 of reprogramming (compare to Figure 2, day 14). (C) Low magnification image on day 17 of reprogramming with a large, barren patch circled in red. (D) The same well was fixed and stained for TRA-1–60 to confirm overall poor reprogramming efficiency due to low cell density. Scale bar = 200 μm (A, B) and 1 mm (C, D).