<prompt> MHC class III genes encode -Complement component C3Tumor necrosis factorInterleukin 2Beta 2 microglobulin  <response>: class 3 or complement components C2 C3 of the classical pathway, as well as properdin factor B of the alternate pathway, heat shock proteina tumor necrosis factor alpha beta Reff: Ananthanarayanan Panikers textbook of microbiology 9th edition pg:140 