There are provided a magnetoresistance effect element, a magnetic head, a magnetic head assembly and a magnetic recording system, which have high sensitivity and high reliability. The method of the present invention preferably uses reduced thioredoxin with wheat flour which imparts a stronger dough and higher loaf volumes. The receiver is provided on the body of the vehicle and works to receive the pressure signal and determine the inflation pressure of the tire based on the pressure signal. The inner surface of the trench has a first side wall and a second side wall located deeper than the first side wall and having a portion made of the second region. The second interlayer insulating layer defines a trench such that at least a portion of an upper surface of the first interlayer insulating layer is exposed. The second linking member is formed with a press member that maintains contact with the flexible member, such that it transversely deflects the flexible member inward toward the key base responsive to the application of a pressing force upon the key cap.