According to a disclosed embodiment, a gas is supplied at a certain partial pressure for a chemical reaction with a top surface of a base in a transistor. A bearing unit may further comprise an lubricating oil seal member and the space-forming member may be used to form a passage way for lubricating oil to prevent lubricating oil from leaking. , bispecific antibodies, comprising a chemokine receptor binding domain and a T cell surface polypeptide or cell toxin binding domain, nucleic acids that encode them, and methods of making and using them.