Abstract: A recombinant vector containing a cassette for transcription by RNA polymerase III is disclosed. The cassette contains a viral gene transcribed by RNA polymerase III into which an oligonucleotide, a DNA fragment, has been inserted between or outside the boxes A and B constituting the promoter of the viral gene is provided. A method for the intracellular production of an RNA fragment in vitro or in vivo, in which eukaryotic cells containing RNA polymerase III are transfected or infected with a vector according to the invention, containing as oligonucleotides a DNA fragment corresponding to the reverse transcript of the RNA, and in which the eukaryotic cells thus transfected or infected are cultured in a suitable culture medium is also provided. The use of the vectors as a medicinal product is further provided.

Abstract: A short travel key switch comprising an electrically insulating base having a bottom and a cylindrical lateral wall defining a cavity closed by a cap. A central contact and a lateral contact are mounted on the bottom. The periphery of a switching element received in the cavity is in electrical contact with the lateral contact. The element is elastically yieldable to establish an electrical connection between the two contacts in response to an axial load exerted on its convex face by the facing portion of an actuator. The central contact is mounted flush with a plane central portion of the bottom. The facing portion of the actuator which engages the central contact is flat.