Model acupuncture point: Bone marrow-derived stromal stem cells are moved by a weak electromagnetic field

Figure 6 The effect of a metal rod (needle) on the arrangement of rat bone marrow-derived stromal stem cells. rBMSCs in 4 mL of culture medium were plated in 50-mm culture dishes at 20000 cells/cm² and cultured with the needle in the centre of the dishes (A) or without the needle (B) for one day. Cells in the dishes were fixed and stained with crystal violet. The vertical walls of the dishes were removed. The stained bottoms of the dishes were scanned. Arrows mark the central depression (1); the central ring (2); the central heap (3); and the peripheral ring (4). rBMSCs: Rat bone marrow-derived stromal stem cells.