negatively regulates plasma cell differentiation negative regulation of immune effector process negative regulation of B cell differentiation negative regulation of immune response biological regulation regulation of plasma cell differentiation negative regulation of plasma cell differentiation inhibition of plasma cell differentiation inhibition of plasma cell development Any process that stops, prevents or reduces the frequency, rate or extent of plasma cell differentiation. down-regulation of plasma cell development down regulation of plasma cell differentiation bf down regulation of plasma cell development downregulation of plasma cell differentiation negative regulation of plasma cell development downregulation of plasma cell development GO:1900099 down-regulation of plasma cell differentiation biological_process 2012-02-15T10:46:05Z