Abstract: The present invention relates to a method for producing an antibody, to an antibody specifically reacting with plasma cells, to genes which encode such antibodies, to antigens which are labeled by such an antibody, to additional antibodies directed against said antigens and to methods for producing said antibodies and to uses of such antibodies. In addition, the present invention relates to single-chain multifunctional polypeptides comprising (a) a first domain comprising a binding site of the antibodies defined herein and (b) a second domain comprising a binding site of an immunoglobulin chain or an antibody specifically recognizing the CD3 antigen. Furthermore, compositions and kits comprising the compounds of the invention are disclosed. Preferably said compositions are pharmaceutical or diagnostic compositions.

Abstract: Novel C/N-- and B/C/N polymers which can be obtained by reaction of (a) a carbodiimide having the formula R.sub.3 E--NCN--ER.sub.3, in which R includes a group selected from the group consisting of alkyl groups and aryl groups, and E comprises a component selected from the group consisting of Si, Ge, and Sn, and (b) a halogenotriazine. Methods for making and using said polymers.