An apparatus and method for execution in a computer system are provided. By applying a sensing current to both the magnetoresistive element and the injection layer, an output of the magnetic head can be multiplied significnantly. A regulatory T-cell number increasing agent, a method of enhancing growth of a lactic acid bacterium, a method of increasing the number of regulatory T-cells, a method of evaluating a regulatory T-cell number increasing effect, and a method of evaluating a growth enhancing effect on a lactic acid bacterium are also provided. The constant update of nodal topology by each node allows a fast identification of alternate physical path for failed virtual path. The cosmetic composition includes one or more compounds selected from N-long chain acylamino acids represented by formula : 1wherein n represents 1 or 2, and R represents a saturated or unsaturated hydrocarbon group of from 5 to 23 carbon atoms; and salts thereof.