If the actual cost is higher than the fixed cost, the cost variance is unfavorable. For example, your standard fixed overhead cost is $3 per unit. If your actual fixed overhead cost is $4 per unit, you have an unfavorable variance of $1.
The major histocompatibility complex and its functions. The function of MHC molecules is to bind peptide fragments derived from pathogens and display them on the cell surface for recognition by the appropriate T cells.
These transport molecules are called the Major Histocompatibility Complex (MHC) proteins. Without these, there would be no presentation of internal or external antigens to the T cells. The importance of MHC proteins is that they allow T cells to distinguish self from non-self.