Abstract: The present invention relates to recombinant DNA comprising DNA coding for smooth-muscle-type myosin heavy chain SM1 isoform protein inserted into vector DNA, a microorganism carrying the recombinant DNA, and an agent for treatment of arteriosclerosis comprising the recombinant DNA. The recombinant DNA of the present invention can be used effectively as an agent for gene therapy of restenosis after PTCA treatment.

Abstract: An object of the invention is to provide thermosetting amic acid microfine particles, thermosetting imide microfine particles and crosslinked imide microfine particles of controlled particle shape and size distribution. The invention provides a production technology which comprises mixing a first solution containing a tetracarboxylic anhydride and a C═C bond-containing acid anhydride with a second solution containing a diamine compound, causing precipitation of thermosetting amic acid microfine particles from the resulting mixture, and further producing thermosetting imide microfine particles and crosslinked imide microfine particles from the thermosetting amic acid microfine particles.