Biological process

down regulation of MHC class II biosynthetic process, down-regulation of MHC class II biosynthetic process, downregulation of MHC class II biosynthetic process, negative regulation of MHC class II anabolism, negative regulation of MHC class II biosynthesis, negative regulation of MHC class II formation, negative regulation of MHC class II synthesis, negative regulation of major histocompatibility complex class II biosynthesis, negative regulation of major histocompatibility complex class II biosynthetic process

Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of MHC class II.