Representative growth curves. The indicated cybrids were grown in high-glucose DMEM in the presence (open squares) or absence (solid circles) of both uridine and pyruvate (A, C, and E), in DMEM (no glucose) plus galactose in the presence (open squares) or absence (solid circles) of both uridine and pyruvate, and in the presence of either uridine (open circles) or pyruvate (solid squares) alone (B, D, and F).