Disclosed are a stable recombinant cell clones which are stable in serum- and protein-free medium for at least 40 generations, a biomass obtained by multiplying the stable cell clone under serum- and protein-free culturing conditions, and a method of preparing recombinant proteins by means of the biomass. The inner layer also can include a desiccant and can be embossed. This arrangement avoids accidental finger jam when collapsing the upper frame unit and the lower frame unit, assuring a high level of safety. A first segment may include the control stream, the cluster map stream and a first portion of the data stream. Thereafter, the new message can be sent to the select group. In this fitting method, a tire is fitted to a wheel, and then core positions of fastening holes are, or a core position of a hub hole is, adjusted in the wheel to minimize an amount of eccentricity of an assembled body including the tire and the wheel.