TABLE 2.

Effect of F-A2M on morphology and contractility of heart cells

F-A2M concn (μg/ml)	Time (h)a	Morphology	Contractionb
0	1 to 4	Normal	+
1	1 to 4	Normal	+
10	1 to 4	Normal	+
100	1 to 4	Normal	+
0	20	Normal	+
1	20	Normal	+
10	20	Normal	−
100	20	Altered	−

^aThe cultures were observed under the inverted optical microscope for 1 to 4 hours, and after 20 h incubation.

^bIndicated are the presence (+) or absence (−) of heart cell contraction. Results shown are the means of four independent experiments.