There is disclosed a polypeptide and DNA sequences, vectors and transformed host cells useful in providing CD30-L polypeptides. The absorber has a body unit having a foreside constricted portion and a backside constricted portion, and a pair of extension units extending outside in the widthwise direction of the absorber from the body unit. Each device includes a base connected to the seat, attachment means for attaching the seat to the rest of the aircraft, the attachment means being movable between a retracted position for fitting or dismantling the seat and an active position for blocking the seat. If the license manager determines that a license file needs to be generated, the license manager outputs the licensing information to the license generator with a request that the latter generate a tamper-proof encrypted license file. The methods employ as refolding agents one or more compounds which are acid substituted aminocyclohexanes.